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mergerfs/libfuse/lib/fuse_lowlevel.cpp

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/*
FUSE: Filesystem in Userspace
Copyright (C) 2001-2007 Miklos Szeredi <miklos@szeredi.hu>
This program can be distributed under the terms of the GNU LGPLv2.
See the file COPYING.LIB
*/
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#include "mutex.hpp"
#include "debug.hpp"
#include "fuse_cfg.hpp"
#include "fuse_i.h"
#include "fuse_kernel.h"
#include "fuse_msgbuf.hpp"
#include "fuse_opt.h"
#include "stat_utils.h"
#include "fmt/core.h"
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <string.h>
#include <unistd.h>
#include <limits.h>
#include <errno.h>
#include <assert.h>
#include <sys/file.h>
#ifndef F_LINUX_SPECIFIC_BASE
#define F_LINUX_SPECIFIC_BASE 1024
#endif
#ifndef F_SETPIPE_SZ
#define F_SETPIPE_SZ (F_LINUX_SPECIFIC_BASE + 7)
#endif
#define PARAM(inarg) (((char*)(inarg)) + sizeof(*(inarg)))
#define OFFSET_MAX 0x7fffffffffffffffLL
#define container_of(ptr, type, member) ({ \
const decltype( ((type*)0)->member ) *__mptr = (ptr); \
(type *)( (char*)__mptr - offsetof(type,member) );})
struct fuse_ll
{
struct fuse_lowlevel_ops op;
void *userdata;
fuse_conn_info_t conn;
pthread_mutex_t lock;
int got_init;
int got_destroy;
uint64_t notify_ctr;
struct fuse_notify_req notify_list;
};
static fuse_ll f = {0};
static
void
convert_stat(const struct stat *stbuf_,
struct fuse_attr *attr_)
{
attr_->ino = stbuf_->st_ino;
attr_->mode = stbuf_->st_mode;
attr_->nlink = stbuf_->st_nlink;
attr_->uid = stbuf_->st_uid;
attr_->gid = stbuf_->st_gid;
attr_->rdev = stbuf_->st_rdev;
attr_->size = stbuf_->st_size;
attr_->blksize = stbuf_->st_blksize;
attr_->blocks = stbuf_->st_blocks;
attr_->atime = stbuf_->st_atime;
attr_->mtime = stbuf_->st_mtime;
attr_->ctime = stbuf_->st_ctime;
attr_->atimensec = ST_ATIM_NSEC(stbuf_);
attr_->mtimensec = ST_MTIM_NSEC(stbuf_);
attr_->ctimensec = ST_CTIM_NSEC(stbuf_);
}
static
size_t
iov_length(const struct iovec *iov,
size_t count)
{
size_t seg;
size_t ret = 0;
for(seg = 0; seg < count; seg++)
ret += iov[seg].iov_len;
return ret;
}
static
int
fuse_send_msg(struct fuse_chan *ch,
struct iovec *iov,
int count)
{
int rv;
struct fuse_out_header *out = (fuse_out_header*)iov[0].iov_base;
out->len = iov_length(iov, count);
rv = writev(fuse_chan_fd(ch),iov,count);
if(rv == -1)
return -errno;
return 0;
}
#define MAX_ERRNO 4095
int
fuse_send_reply_iov_nofree(fuse_req_t *req,
int error,
struct iovec *iov,
int count)
{
struct fuse_out_header out;
if(error > 0)
error = -error;
if(error <= -MAX_ERRNO)
{
fprintf(stderr,"fuse: bad error value: %i\n",error);
error = -ERANGE;
}
out.unique = req->ctx.unique;
out.error = error;
iov[0].iov_base = &out;
iov[0].iov_len = sizeof(struct fuse_out_header);
return fuse_send_msg(req->ch, iov, count);
}
static
int
send_reply_iov(fuse_req_t *req_,
int error_,
struct iovec *iov_,
int count_)
{
int rv;
rv = fuse_send_reply_iov_nofree(req_, error_, iov_, count_);
fuse_req_free(req_);
return rv;
}
static
int
send_reply(fuse_req_t *req,
int error,
const void *arg,
size_t argsize)
{
struct iovec iov[2];
int count = 1;
if(argsize)
{
iov[1].iov_base = (void *) arg;
iov[1].iov_len = argsize;
count++;
}
return send_reply_iov(req, error, iov, count);
}
static
void
convert_statfs(const struct statvfs *stbuf,
struct fuse_kstatfs *kstatfs)
{
kstatfs->bsize = stbuf->f_bsize;
kstatfs->frsize = stbuf->f_frsize;
kstatfs->blocks = stbuf->f_blocks;
kstatfs->bfree = stbuf->f_bfree;
kstatfs->bavail = stbuf->f_bavail;
kstatfs->files = stbuf->f_files;
kstatfs->ffree = stbuf->f_ffree;
kstatfs->namelen = stbuf->f_namemax;
}
static
int
send_reply_ok(fuse_req_t *req,
const void *arg,
size_t argsize)
{
return send_reply(req, 0, arg, argsize);
}
int
fuse_reply_err(fuse_req_t *req_,
int err_)
{
return send_reply(req_,err_,NULL,0);
}
void
fuse_reply_none(fuse_req_t *req_)
{
fuse_req_free(req_);
}
static
void
fill_entry(struct fuse_entry_out *arg,
const struct fuse_entry_param *e)
{
arg->nodeid = e->ino;
arg->generation = e->generation;
arg->entry_valid = e->timeout.entry;
arg->entry_valid_nsec = 0;
arg->attr_valid = e->timeout.attr;
arg->attr_valid_nsec = 0;
convert_stat(&e->attr,&arg->attr);
}
static
void
fill_open(struct fuse_open_out *arg_,
const fuse_file_info_t *ffi_)
{
arg_->fh = ffi_->fh;
if(ffi_->direct_io)
arg_->open_flags |= FOPEN_DIRECT_IO;
if(ffi_->keep_cache)
arg_->open_flags |= FOPEN_KEEP_CACHE;
if(ffi_->nonseekable)
arg_->open_flags |= FOPEN_NONSEEKABLE;
if(ffi_->cache_readdir)
arg_->open_flags |= FOPEN_CACHE_DIR;
if(ffi_->parallel_direct_writes)
arg_->open_flags |= FOPEN_PARALLEL_DIRECT_WRITES;
if(ffi_->noflush)
arg_->open_flags |= FOPEN_NOFLUSH;
if(ffi_->passthrough && (ffi_->backing_id > 0))
{
arg_->open_flags |= FOPEN_PASSTHROUGH;
arg_->backing_id = ffi_->backing_id;
}
}
int
fuse_reply_entry(fuse_req_t *req,
const struct fuse_entry_param *e)
{
struct fuse_entry_out arg = {0};
size_t size = f.conn.proto_minor < 9 ?
FUSE_COMPAT_ENTRY_OUT_SIZE : sizeof(arg);
/* before ABI 7.4 e->ino == 0 was invalid, only ENOENT meant
negative entry */
if(!e->ino && f.conn.proto_minor < 4)
return fuse_reply_err(req, ENOENT);
fill_entry(&arg, e);
#ifdef NDEBUG
// TODO: Add checks for cases where a node could be marked bad by
// the kernel.
#endif
return send_reply_ok(req, &arg, size);
}
struct fuse_create_out
{
struct fuse_entry_out e;
struct fuse_open_out o;
};
int
fuse_reply_create(fuse_req_t *req_,
const struct fuse_entry_param *e_,
const fuse_file_info_t *ffi_)
{
struct fuse_create_out buf = {0};
size_t entrysize = (f.conn.proto_minor < 9) ?
FUSE_COMPAT_ENTRY_OUT_SIZE : sizeof(struct fuse_entry_out);
struct fuse_entry_out *earg = (struct fuse_entry_out*)&buf.e;
struct fuse_open_out *oarg = (struct fuse_open_out*)(((char*)&buf)+entrysize);
fill_entry(earg, e_);
fill_open(oarg, ffi_);
return send_reply_ok(req_, &buf, entrysize + sizeof(struct fuse_open_out));
}
int
fuse_reply_attr(fuse_req_t *req,
const struct stat *attr,
const uint64_t timeout)
{
struct fuse_attr_out arg = {0};
size_t size = f.conn.proto_minor < 9 ?
FUSE_COMPAT_ATTR_OUT_SIZE : sizeof(arg);
arg.attr_valid = timeout;
arg.attr_valid_nsec = 0;
convert_stat(attr,&arg.attr);
return send_reply_ok(req,&arg,size);
}
int
fuse_reply_statx(fuse_req_t *req_,
int flags_,
struct fuse_statx *st_,
uint64_t timeout_)
{
struct fuse_statx_out outarg{};
outarg.flags = flags_;
outarg.attr_valid = timeout_;
outarg.attr_valid_nsec = 0;
outarg.stat = *(struct fuse_statx*)st_;
return send_reply_ok(req_,&outarg,sizeof(outarg));
}
int
fuse_reply_readlink(fuse_req_t *req,
const char *linkname)
{
return send_reply_ok(req, linkname, strlen(linkname));
}
int
fuse_reply_open(fuse_req_t *req,
const fuse_file_info_t *f)
{
struct fuse_open_out arg = {0};
fill_open(&arg, f);
return send_reply_ok(req, &arg, sizeof(arg));
}
int
fuse_reply_write(fuse_req_t *req,
size_t count)
{
struct fuse_write_out arg = {0};
arg.size = count;
return send_reply_ok(req, &arg, sizeof(arg));
}
int
fuse_reply_buf(fuse_req_t *req,
const char *buf,
size_t size)
{
return send_reply_ok(req, buf, size);
}
static
int
fuse_send_data_iov_fallback(struct fuse_chan *ch,
struct iovec *iov,
int iov_count,
struct fuse_bufvec *buf,
size_t len)
{
int res;
struct fuse_bufvec mem_buf = FUSE_BUFVEC_INIT(len);
/* Optimize common case */
if(buf->count == 1 && buf->idx == 0 && buf->off == 0 &&
!(buf->buf[0].flags & FUSE_BUF_IS_FD))
{
/* FIXME: also avoid memory copy if there are multiple buffers
but none of them contain an fd */
iov[iov_count].iov_base = buf->buf[0].mem;
iov[iov_count].iov_len = len;
iov_count++;
return fuse_send_msg(ch, iov, iov_count);
}
fuse_msgbuf_t *msgbuf;
msgbuf = msgbuf_alloc();
if(msgbuf == NULL)
return -ENOMEM;
mem_buf.buf[0].mem = msgbuf->mem;
res = fuse_buf_copy(&mem_buf, buf, (fuse_buf_copy_flags)0);
if(res < 0)
{
msgbuf_free(msgbuf);
return -res;
}
len = res;
iov[iov_count].iov_base = msgbuf->mem;
iov[iov_count].iov_len = len;
iov_count++;
res = fuse_send_msg(ch, iov, iov_count);
msgbuf_free(msgbuf);
return res;
}
static
int
fuse_send_data_iov(struct fuse_chan *ch,
struct iovec *iov,
int iov_count,
struct fuse_bufvec *buf,
unsigned int flags)
{
size_t len = fuse_buf_size(buf);
(void) flags;
return fuse_send_data_iov_fallback(ch, iov, iov_count, buf, len);
}
int
fuse_reply_data(fuse_req_t *req,
char *buf_,
const size_t bufsize_)
{
int res;
struct iovec iov[2];
struct fuse_out_header out;
iov[0].iov_base = &out;
iov[0].iov_len = sizeof(struct fuse_out_header);
iov[1].iov_base = buf_;
iov[1].iov_len = bufsize_;
out.unique = req->ctx.unique;
out.error = 0;
res = fuse_send_msg(req->ch,iov,2);
if(res <= 0)
{
fuse_req_free(req);
return res;
}
else
{
return fuse_reply_err(req, res);
}
}
int
fuse_reply_statfs(fuse_req_t *req,
const struct statvfs *stbuf)
{
struct fuse_statfs_out arg = {0};
size_t size = f.conn.proto_minor < 4 ?
FUSE_COMPAT_STATFS_SIZE : sizeof(arg);
convert_statfs(stbuf, &arg.st);
return send_reply_ok(req, &arg, size);
}
int
fuse_reply_xattr(fuse_req_t *req,
size_t count)
{
struct fuse_getxattr_out arg = {0};
arg.size = count;
return send_reply_ok(req, &arg, sizeof(arg));
}
int
fuse_reply_lock(fuse_req_t *req,
const struct flock *lock)
{
struct fuse_lk_out arg = {0};
arg.lk.type = lock->l_type;
if(lock->l_type != F_UNLCK)
{
arg.lk.start = lock->l_start;
if(lock->l_len == 0)
arg.lk.end = OFFSET_MAX;
else
arg.lk.end = lock->l_start + lock->l_len - 1;
}
arg.lk.pid = lock->l_pid;
return send_reply_ok(req, &arg, sizeof(arg));
}
int
fuse_reply_bmap(fuse_req_t *req,
uint64_t idx)
{
struct fuse_bmap_out arg = {0};
arg.block = idx;
return send_reply_ok(req, &arg, sizeof(arg));
}
static
struct fuse_ioctl_iovec*
fuse_ioctl_iovec_copy(const struct iovec *iov,
size_t count)
{
struct fuse_ioctl_iovec *fiov;
size_t i;
fiov = (fuse_ioctl_iovec*)malloc(sizeof(fiov[0]) * count);
if(!fiov)
return NULL;
for (i = 0; i < count; i++)
{
fiov[i].base = (uintptr_t) iov[i].iov_base;
fiov[i].len = iov[i].iov_len;
}
return fiov;
}
int
fuse_reply_ioctl_retry(fuse_req_t *req,
const struct iovec *in_iov,
size_t in_count,
const struct iovec *out_iov,
size_t out_count)
{
struct fuse_ioctl_out arg = {0};
struct fuse_ioctl_iovec *in_fiov = NULL;
struct fuse_ioctl_iovec *out_fiov = NULL;
struct iovec iov[4];
size_t count = 1;
int res;
arg.flags |= FUSE_IOCTL_RETRY;
arg.in_iovs = in_count;
arg.out_iovs = out_count;
iov[count].iov_base = &arg;
iov[count].iov_len = sizeof(arg);
count++;
if(f.conn.proto_minor < 16)
{
if(in_count)
{
iov[count].iov_base = (void *)in_iov;
iov[count].iov_len = sizeof(in_iov[0]) * in_count;
count++;
}
if(out_count)
{
iov[count].iov_base = (void *)out_iov;
iov[count].iov_len = sizeof(out_iov[0]) * out_count;
count++;
}
}
else
{
/* Can't handle non-compat 64bit ioctls on 32bit */
if((sizeof(void *) == 4) && (req->ioctl_64bit))
{
res = fuse_reply_err(req, EINVAL);
goto out;
}
if(in_count)
{
in_fiov = fuse_ioctl_iovec_copy(in_iov, in_count);
if(!in_fiov)
goto enomem;
iov[count].iov_base = (void *)in_fiov;
iov[count].iov_len = sizeof(in_fiov[0]) * in_count;
count++;
}
if(out_count)
{
out_fiov = fuse_ioctl_iovec_copy(out_iov, out_count);
if(!out_fiov)
goto enomem;
iov[count].iov_base = (void *)out_fiov;
iov[count].iov_len = sizeof(out_fiov[0]) * out_count;
count++;
}
}
res = send_reply_iov(req, 0, iov, count);
out:
free(in_fiov);
free(out_fiov);
return res;
enomem:
res = fuse_reply_err(req, ENOMEM);
goto out;
}
int
fuse_reply_ioctl(fuse_req_t *req,
int result,
const void *buf,
uint32_t size)
{
int count;
struct iovec iov[3];
struct fuse_ioctl_out arg;
arg.result = result;
arg.flags = 0;
arg.in_iovs = 0;
arg.out_iovs = 0;
count = 1;
iov[count].iov_base = &arg;
iov[count].iov_len = sizeof(arg);
count++;
if(size)
{
iov[count].iov_base = (char*)buf;
iov[count].iov_len = size;
count++;
}
return send_reply_iov(req, 0, iov, count);
}
int
fuse_reply_ioctl_iov(fuse_req_t *req,
int result,
const struct iovec *iov,
int count)
{
struct iovec *padded_iov;
struct fuse_ioctl_out arg = {0};
int res;
padded_iov = (iovec*)malloc((count + 2) * sizeof(struct iovec));
if(padded_iov == NULL)
return fuse_reply_err(req, ENOMEM);
arg.result = result;
padded_iov[1].iov_base = &arg;
padded_iov[1].iov_len = sizeof(arg);
memcpy(&padded_iov[2], iov, count * sizeof(struct iovec));
res = send_reply_iov(req, 0, padded_iov, count + 2);
free(padded_iov);
return res;
}
static
void
do_lookup(fuse_req_t *req,
struct fuse_in_header *hdr_)
{
f.op.lookup(req,hdr_);
}
static
void
do_forget(fuse_req_t *req,
struct fuse_in_header *hdr_)
{
f.op.forget(req,hdr_);
}
static
void
do_batch_forget(fuse_req_t *req,
struct fuse_in_header *hdr_)
{
f.op.forget_multi(req,hdr_);
}
static
void
do_getattr(fuse_req_t *req,
struct fuse_in_header *hdr_)
{
f.op.getattr(req, hdr_);
}
static
void
do_setattr(fuse_req_t *req_,
struct fuse_in_header *hdr_)
{
f.op.setattr(req_,hdr_);
}
static
void
do_access(fuse_req_t *req,
struct fuse_in_header *hdr_)
{
f.op.access(req,hdr_);
}
static
void
do_readlink(fuse_req_t *req,
struct fuse_in_header *hdr_)
{
f.op.readlink(req,hdr_);
}
static
void
do_mknod(fuse_req_t *req,
struct fuse_in_header *hdr_)
{
f.op.mknod(req,hdr_);
}
static
void
do_mkdir(fuse_req_t *req,
struct fuse_in_header *hdr_)
{
f.op.mkdir(req,hdr_);
}
static
void
do_unlink(fuse_req_t *req,
struct fuse_in_header *hdr_)
{
f.op.unlink(req,hdr_);
}
static
void
do_rmdir(fuse_req_t *req,
struct fuse_in_header *hdr_)
{
f.op.rmdir(req,hdr_);
}
static
void
do_symlink(fuse_req_t *req,
struct fuse_in_header *hdr_)
{
f.op.symlink(req,hdr_);
}
static
void
do_rename(fuse_req_t *req,
struct fuse_in_header *hdr_)
{
f.op.rename(req,hdr_);
}
static
void
do_link(fuse_req_t *req,
struct fuse_in_header *hdr_)
{
f.op.link(req,hdr_);
}
static
void
do_create(fuse_req_t *req,
struct fuse_in_header *hdr_)
{
f.op.create(req,hdr_);
}
static
void
do_open(fuse_req_t *req,
struct fuse_in_header *hdr_)
{
f.op.open(req,hdr_);
}
static
void
do_read(fuse_req_t *req,
struct fuse_in_header *hdr_)
{
f.op.read(req,hdr_);
}
static
void
do_write(fuse_req_t *req,
struct fuse_in_header *hdr_)
{
f.op.write(req,hdr_);
}
static
void
do_flush(fuse_req_t *req,
struct fuse_in_header *hdr_)
{
f.op.flush(req,hdr_);
}
static
void
do_release(fuse_req_t *req,
struct fuse_in_header *hdr_)
{
f.op.release(req,hdr_);
}
static
void
do_fsync(fuse_req_t *req,
struct fuse_in_header *hdr_)
{
f.op.fsync(req,hdr_);
}
static
void
do_opendir(fuse_req_t *req,
struct fuse_in_header *hdr_)
{
f.op.opendir(req,hdr_);
}
static
void
do_readdir(fuse_req_t *req,
struct fuse_in_header *hdr_)
{
f.op.readdir(req,hdr_);
}
static
void
do_readdirplus(fuse_req_t *req_,
struct fuse_in_header *hdr_)
{
f.op.readdir_plus(req_,hdr_);
}
static
void
do_releasedir(fuse_req_t *req,
struct fuse_in_header *hdr_)
{
f.op.releasedir(req,hdr_);
}
static
void
do_fsyncdir(fuse_req_t *req,
struct fuse_in_header *hdr_)
{
f.op.fsyncdir(req,hdr_);
}
static
void
do_statfs(fuse_req_t *req,
struct fuse_in_header *hdr_)
{
f.op.statfs(req,hdr_);
}
static
void
do_setxattr(fuse_req_t *req,
struct fuse_in_header *hdr_)
{
f.op.setxattr(req,hdr_);
}
static
void
do_getxattr(fuse_req_t *req,
struct fuse_in_header *hdr_)
{
f.op.getxattr(req,hdr_);
}
static
void
do_listxattr(fuse_req_t *req,
struct fuse_in_header *hdr_)
{
f.op.listxattr(req,hdr_);
}
static
void
do_removexattr(fuse_req_t *req,
struct fuse_in_header *hdr_)
{
f.op.removexattr(req,hdr_);
}
static
void
convert_fuse_file_lock(struct fuse_file_lock *fl,
struct flock *flock)
{
memset(flock, 0, sizeof(struct flock));
flock->l_type = fl->type;
flock->l_whence = SEEK_SET;
flock->l_start = fl->start;
if(fl->end == OFFSET_MAX)
flock->l_len = 0;
else
flock->l_len = fl->end - fl->start + 1;
flock->l_pid = fl->pid;
}
static
void
do_getlk(fuse_req_t *req,
struct fuse_in_header *hdr_)
{
f.op.getlk(req,hdr_);
}
static
void
do_setlk_common(fuse_req_t *req,
uint64_t nodeid,
const void *inarg,
int sleep)
{
struct flock flock;
fuse_file_info_t fi = {0};
struct fuse_lk_in *arg = (struct fuse_lk_in*)inarg;
fi.fh = arg->fh;
fi.lock_owner = arg->owner;
if(arg->lk_flags & FUSE_LK_FLOCK)
{
int op = 0;
switch (arg->lk.type)
{
case F_RDLCK:
op = LOCK_SH;
break;
case F_WRLCK:
op = LOCK_EX;
break;
case F_UNLCK:
op = LOCK_UN;
break;
}
if(!sleep)
op |= LOCK_NB;
f.op.flock(req,nodeid,&fi,op);
}
else
{
convert_fuse_file_lock(&arg->lk, &flock);
f.op.setlk(req,nodeid,&fi,&flock,sleep);
}
}
static
void
do_setlk(fuse_req_t *req,
struct fuse_in_header *hdr_)
{
do_setlk_common(req, hdr_->nodeid, &hdr_[1], 0);
}
static
void
do_setlkw(fuse_req_t *req,
struct fuse_in_header *hdr_)
{
do_setlk_common(req, hdr_->nodeid, &hdr_[1], 1);
}
static
void
do_interrupt(fuse_req_t *req_,
struct fuse_in_header *hdr_)
{
fuse_req_free(req_);
}
static
void
do_bmap(fuse_req_t *req,
struct fuse_in_header *hdr_)
{
f.op.bmap(req,hdr_);
}
static
void
do_ioctl(fuse_req_t *req,
struct fuse_in_header *hdr_)
{
f.op.ioctl(req, hdr_);
}
static
void
do_poll(fuse_req_t *req,
struct fuse_in_header *hdr_)
{
f.op.poll(req,hdr_);
}
static
void
do_fallocate(fuse_req_t *req,
struct fuse_in_header *hdr_)
{
f.op.fallocate(req,hdr_);
}
static
void
do_init(fuse_req_t *req,
struct fuse_in_header *hdr_)
{
struct fuse_init_out outarg = {0};
struct fuse_init_in *arg = (struct fuse_init_in *)&hdr_[1];
size_t bufsize;
uint64_t inargflags;
uint64_t outargflags;
u32 max_write;
u32 max_readahead;
max_write = UINT_MAX;
max_readahead = UINT_MAX;
bufsize = fuse_chan_bufsize(req->ch);
inargflags = 0;
outargflags = 0;
fuse_syslog_fuse_init_in(arg);
f.conn.proto_major = arg->major;
f.conn.proto_minor = arg->minor;
f.conn.capable = 0;
f.conn.want = 0;
outarg.major = FUSE_KERNEL_VERSION;
outarg.minor = FUSE_KERNEL_MINOR_VERSION;
outarg.max_pages = FUSE_DEFAULT_MAX_PAGES_PER_REQ;
if(arg->major < 7)
{
fprintf(stderr, "fuse: unsupported protocol version: %u.%u\n",
arg->major, arg->minor);
fuse_reply_err(req, EPROTO);
return;
}
if(arg->major > 7)
{
/* Wait for a second INIT request with a 7.X version */
send_reply_ok(req, &outarg, sizeof(outarg));
return;
}
if(arg->minor >= 6)
{
inargflags = arg->flags;
if(inargflags & FUSE_INIT_EXT)
inargflags |= (((uint64_t)arg->flags2) << 32);
if(arg->max_readahead < max_readahead)
max_readahead = arg->max_readahead;
if(inargflags & FUSE_ASYNC_READ)
f.conn.capable |= FUSE_CAP_ASYNC_READ;
if(inargflags & FUSE_POSIX_LOCKS)
f.conn.capable |= FUSE_CAP_POSIX_LOCKS;
if(inargflags & FUSE_ATOMIC_O_TRUNC)
f.conn.capable |= FUSE_CAP_ATOMIC_O_TRUNC;
if(inargflags & FUSE_EXPORT_SUPPORT)
f.conn.capable |= FUSE_CAP_EXPORT_SUPPORT;
if(inargflags & FUSE_BIG_WRITES)
f.conn.capable |= FUSE_CAP_BIG_WRITES;
if(inargflags & FUSE_DONT_MASK)
f.conn.capable |= FUSE_CAP_DONT_MASK;
if(inargflags & FUSE_FLOCK_LOCKS)
f.conn.capable |= FUSE_CAP_FLOCK_LOCKS;
if(inargflags & FUSE_POSIX_ACL)
f.conn.capable |= FUSE_CAP_POSIX_ACL;
if(inargflags & FUSE_CACHE_SYMLINKS)
f.conn.capable |= FUSE_CAP_CACHE_SYMLINKS;
if(inargflags & FUSE_ASYNC_DIO)
f.conn.capable |= FUSE_CAP_ASYNC_DIO;
if(inargflags & FUSE_PARALLEL_DIROPS)
f.conn.capable |= FUSE_CAP_PARALLEL_DIROPS;
if(inargflags & FUSE_MAX_PAGES)
f.conn.capable |= FUSE_CAP_MAX_PAGES;
if(inargflags & FUSE_WRITEBACK_CACHE)
f.conn.capable |= FUSE_CAP_WRITEBACK_CACHE;
if(inargflags & FUSE_DO_READDIRPLUS)
f.conn.capable |= FUSE_CAP_READDIR_PLUS;
if(inargflags & FUSE_READDIRPLUS_AUTO)
f.conn.capable |= FUSE_CAP_READDIR_PLUS_AUTO;
if(inargflags & FUSE_SETXATTR_EXT)
f.conn.capable |= FUSE_CAP_SETXATTR_EXT;
if(inargflags & FUSE_DIRECT_IO_ALLOW_MMAP)
f.conn.capable |= FUSE_CAP_DIRECT_IO_ALLOW_MMAP;
if(inargflags & FUSE_CREATE_SUPP_GROUP)
f.conn.capable |= FUSE_CAP_CREATE_SUPP_GROUP;
if(inargflags & FUSE_PASSTHROUGH)
f.conn.capable |= FUSE_CAP_PASSTHROUGH;
if(inargflags & FUSE_HANDLE_KILLPRIV)
f.conn.capable |= FUSE_CAP_HANDLE_KILLPRIV;
if(inargflags & FUSE_HANDLE_KILLPRIV_V2)
f.conn.capable |= FUSE_CAP_HANDLE_KILLPRIV_V2;
if(inargflags & FUSE_ALLOW_IDMAP)
f.conn.capable |= FUSE_CAP_ALLOW_IDMAP;
}
else
{
f.conn.want &= ~FUSE_CAP_ASYNC_READ;
max_readahead = 0;
}
if(f.conn.proto_minor >= 18)
f.conn.capable |= FUSE_CAP_IOCTL_DIR;
if(f.op.getlk && f.op.setlk)
f.conn.want |= FUSE_CAP_POSIX_LOCKS;
if(f.op.flock)
f.conn.want |= FUSE_CAP_FLOCK_LOCKS;
if(bufsize < FUSE_MIN_READ_BUFFER)
{
fprintf(stderr, "fuse: warning: buffer size too small: %zu\n",
bufsize);
bufsize = FUSE_MIN_READ_BUFFER;
}
bufsize -= getpagesize();
if(bufsize < max_write)
max_write = bufsize;
f.got_init = 1;
if(f.op.init)
f.op.init(f.userdata, &f.conn);
outargflags = outarg.flags;
if((inargflags & FUSE_MAX_PAGES) && (f.conn.want & FUSE_CAP_MAX_PAGES))
{
outargflags |= FUSE_MAX_PAGES;
outarg.max_pages = fuse_cfg.max_pages;
msgbuf_set_bufsize(outarg.max_pages);
max_write = (msgbuf_get_pagesize() * outarg.max_pages);
}
if(f.conn.want & FUSE_CAP_ASYNC_READ)
outargflags |= FUSE_ASYNC_READ;
if(f.conn.want & FUSE_CAP_POSIX_LOCKS)
outargflags |= FUSE_POSIX_LOCKS;
if(f.conn.want & FUSE_CAP_ATOMIC_O_TRUNC)
outargflags |= FUSE_ATOMIC_O_TRUNC;
if(f.conn.want & FUSE_CAP_EXPORT_SUPPORT)
outargflags |= FUSE_EXPORT_SUPPORT;
if(f.conn.want & FUSE_CAP_BIG_WRITES)
outargflags |= FUSE_BIG_WRITES;
if(f.conn.want & FUSE_CAP_DONT_MASK)
outargflags |= FUSE_DONT_MASK;
if(f.conn.want & FUSE_CAP_FLOCK_LOCKS)
outargflags |= FUSE_FLOCK_LOCKS;
if(f.conn.want & FUSE_CAP_POSIX_ACL)
outargflags |= FUSE_POSIX_ACL;
if(f.conn.want & FUSE_CAP_CACHE_SYMLINKS)
outargflags |= FUSE_CACHE_SYMLINKS;
if(f.conn.want & FUSE_CAP_ASYNC_DIO)
outargflags |= FUSE_ASYNC_DIO;
if(f.conn.want & FUSE_CAP_PARALLEL_DIROPS)
outargflags |= FUSE_PARALLEL_DIROPS;
if(f.conn.want & FUSE_CAP_WRITEBACK_CACHE)
outargflags |= FUSE_WRITEBACK_CACHE;
if(f.conn.want & FUSE_CAP_READDIR_PLUS)
outargflags |= FUSE_DO_READDIRPLUS;
if(f.conn.want & FUSE_CAP_READDIR_PLUS_AUTO)
outargflags |= FUSE_READDIRPLUS_AUTO;
if(f.conn.want & FUSE_CAP_SETXATTR_EXT)
outargflags |= FUSE_SETXATTR_EXT;
if(f.conn.want & FUSE_CAP_CREATE_SUPP_GROUP)
outargflags |= FUSE_CREATE_SUPP_GROUP;
if(f.conn.want & FUSE_CAP_DIRECT_IO_ALLOW_MMAP)
outargflags |= FUSE_DIRECT_IO_ALLOW_MMAP;
if(f.conn.want & FUSE_CAP_HANDLE_KILLPRIV)
outargflags |= FUSE_HANDLE_KILLPRIV;
if(f.conn.want & FUSE_CAP_HANDLE_KILLPRIV_V2)
outargflags |= FUSE_HANDLE_KILLPRIV_V2;
if(f.conn.want & FUSE_CAP_ALLOW_IDMAP)
outargflags |= FUSE_ALLOW_IDMAP;
if(f.conn.want & FUSE_CAP_PASSTHROUGH)
{
outargflags |= FUSE_PASSTHROUGH;
outarg.max_stack_depth = fuse_cfg.passthrough_max_stack_depth;
}
if(inargflags & FUSE_INIT_EXT)
{
outargflags |= FUSE_INIT_EXT;
outarg.flags2 = (outargflags >> 32);
}
outarg.flags = outargflags;
outarg.max_readahead = max_readahead;
outarg.max_write = max_write;
if(f.conn.proto_minor >= 13)
{
if(fuse_cfg.max_background >= (1 << 16))
fuse_cfg.max_background = ((1 << 16) - 1);
if(fuse_cfg.congestion_threshold > fuse_cfg.max_background)
fuse_cfg.congestion_threshold = fuse_cfg.max_background;
if(!fuse_cfg.congestion_threshold)
fuse_cfg.congestion_threshold = (fuse_cfg.max_background * 3 / 4);
outarg.max_background = fuse_cfg.max_background;
outarg.congestion_threshold = fuse_cfg.congestion_threshold;
}
if(f.conn.proto_minor >= 23)
outarg.time_gran = 1;
size_t outargsize;
if(arg->minor < 5)
outargsize = FUSE_COMPAT_INIT_OUT_SIZE;
else if(arg->minor < 23)
outargsize = FUSE_COMPAT_22_INIT_OUT_SIZE;
else
outargsize = sizeof(outarg);
fuse_syslog_fuse_init_out(&outarg);
send_reply_ok(req, &outarg, outargsize);
}
static
void
do_destroy(fuse_req_t *req_,
struct fuse_in_header *hdr_)
{
f.got_destroy = 1;
f.op.destroy(f.userdata);
send_reply_ok(req_,NULL,0);
}
static
void
list_del_nreq(struct fuse_notify_req *nreq)
{
struct fuse_notify_req *prev = nreq->prev;
struct fuse_notify_req *next = nreq->next;
prev->next = next;
next->prev = prev;
}
static
void
list_add_nreq(struct fuse_notify_req *nreq,
struct fuse_notify_req *next)
{
struct fuse_notify_req *prev = next->prev;
nreq->next = next;
nreq->prev = prev;
prev->next = nreq;
next->prev = nreq;
}
static
void
list_init_nreq(struct fuse_notify_req *nreq)
{
nreq->next = nreq;
nreq->prev = nreq;
}
static
void
do_notify_reply(fuse_req_t *req,
struct fuse_in_header *hdr_)
{
struct fuse_notify_req *nreq;
struct fuse_notify_req *head;
mutex_lock(&f.lock);
head = &f.notify_list;
for(nreq = head->next; nreq != head; nreq = nreq->next)
{
if(nreq->unique == req->ctx.unique)
{
list_del_nreq(nreq);
break;
}
}
mutex_unlock(&f.lock);
if(nreq != head)
nreq->reply(nreq, req, hdr_->nodeid, &hdr_[1]);
}
static
void
do_copy_file_range(fuse_req_t *req_,
struct fuse_in_header *hdr_)
{
f.op.copy_file_range(req_,hdr_);
}
static
void
do_setupmapping(fuse_req_t *req_,
struct fuse_in_header *hdr_)
{
f.op.setupmapping(req_,hdr_);
}
static
void
do_removemapping(fuse_req_t *req_,
struct fuse_in_header *hdr_)
{
f.op.removemapping(req_,hdr_);
}
static
void
do_syncfs(fuse_req_t *req_,
struct fuse_in_header *hdr_)
{
f.op.syncfs(req_,hdr_);
}
static
void
do_tmpfile(fuse_req_t *req_,
struct fuse_in_header *hdr_)
{
f.op.tmpfile(req_,hdr_);
}
static
void
do_statx(fuse_req_t *req_,
struct fuse_in_header *hdr_)
{
f.op.statx(req_,hdr_);
}
static
void
do_rename2(fuse_req_t *req_,
struct fuse_in_header *hdr_)
{
f.op.rename2(req_,hdr_);
}
static
void
do_lseek(fuse_req_t *req_,
struct fuse_in_header *hdr_)
{
f.op.lseek(req_,hdr_);
}
static
int
send_notify_iov(struct fuse_chan *ch,
int notify_code,
struct iovec *iov,
int count)
{
struct fuse_out_header out;
if(!f.got_init)
return -ENOTCONN;
out.unique = 0;
out.error = notify_code;
iov[0].iov_base = &out;
iov[0].iov_len = sizeof(struct fuse_out_header);
return fuse_send_msg(ch, iov, count);
}
int
fuse_lowlevel_notify_inval_inode(struct fuse_chan *ch,
uint64_t ino,
off_t off,
off_t len)
{
struct fuse_notify_inval_inode_out outarg;
struct iovec iov[2];
if(!ch)
return -EINVAL;
outarg.ino = ino;
outarg.off = off;
outarg.len = len;
iov[1].iov_base = &outarg;
iov[1].iov_len = sizeof(outarg);
return send_notify_iov(ch, FUSE_NOTIFY_INVAL_INODE, iov, 2);
}
int
fuse_lowlevel_notify_inval_entry(struct fuse_chan *ch,
uint64_t parent,
const char *name,
size_t namelen)
{
struct fuse_notify_inval_entry_out outarg;
struct iovec iov[3];
if(!ch)
return -EINVAL;
outarg.parent = parent;
outarg.namelen = namelen;
// TODO: Add ability to set `flags`
outarg.flags = 0;
iov[1].iov_base = &outarg;
iov[1].iov_len = sizeof(outarg);
iov[2].iov_base = (void *)name;
iov[2].iov_len = namelen + 1;
return send_notify_iov(ch, FUSE_NOTIFY_INVAL_ENTRY, iov, 3);
}
int
fuse_lowlevel_notify_delete(struct fuse_chan *ch,
uint64_t parent,
uint64_t child,
const char *name,
size_t namelen)
{
struct fuse_notify_delete_out outarg;
struct iovec iov[3];
if(!ch)
return -EINVAL;
if(f.conn.proto_minor < 18)
return -ENOSYS;
outarg.parent = parent;
outarg.child = child;
outarg.namelen = namelen;
outarg.padding = 0;
iov[1].iov_base = &outarg;
iov[1].iov_len = sizeof(outarg);
iov[2].iov_base = (void *)name;
iov[2].iov_len = namelen + 1;
return send_notify_iov(ch, FUSE_NOTIFY_DELETE, iov, 3);
}
int
fuse_lowlevel_notify_store(struct fuse_chan *ch,
uint64_t ino,
off_t offset,
struct fuse_bufvec *bufv,
enum fuse_buf_copy_flags flags)
{
struct fuse_out_header out;
struct fuse_notify_store_out outarg;
struct iovec iov[3];
size_t size = fuse_buf_size(bufv);
int res;
if(!ch)
return -EINVAL;
if(f.conn.proto_minor < 15)
return -ENOSYS;
out.unique = 0;
out.error = FUSE_NOTIFY_STORE;
outarg.nodeid = ino;
outarg.offset = offset;
outarg.size = size;
outarg.padding = 0;
iov[0].iov_base = &out;
iov[0].iov_len = sizeof(out);
iov[1].iov_base = &outarg;
iov[1].iov_len = sizeof(outarg);
res = fuse_send_data_iov(ch, iov, 2, bufv, flags);
if(res > 0)
res = -res;
return res;
}
struct fuse_retrieve_req
{
struct fuse_notify_req nreq;
void *cookie;
};
static
void
fuse_ll_retrieve_reply(struct fuse_notify_req *nreq,
fuse_req_t *req,
uint64_t ino,
const void *inarg)
{
struct fuse_retrieve_req *rreq =
container_of(nreq, struct fuse_retrieve_req, nreq);
fuse_reply_none(req);
free(rreq);
}
int
fuse_lowlevel_notify_retrieve(struct fuse_chan *ch,
uint64_t ino,
size_t size,
off_t offset,
void *cookie)
{
struct fuse_notify_retrieve_out outarg;
struct iovec iov[2];
struct fuse_retrieve_req *rreq;
int err;
if(!ch)
return -EINVAL;
if(f.conn.proto_minor < 15)
return -ENOSYS;
rreq = (fuse_retrieve_req*)malloc(sizeof(*rreq));
if(rreq == NULL)
return -ENOMEM;
mutex_lock(&f.lock);
rreq->cookie = cookie;
rreq->nreq.unique = f.notify_ctr++;
rreq->nreq.reply = fuse_ll_retrieve_reply;
list_add_nreq(&rreq->nreq, &f.notify_list);
mutex_unlock(&f.lock);
outarg.notify_unique = rreq->nreq.unique;
outarg.nodeid = ino;
outarg.offset = offset;
outarg.size = size;
iov[1].iov_base = &outarg;
iov[1].iov_len = sizeof(outarg);
err = send_notify_iov(ch, FUSE_NOTIFY_RETRIEVE, iov, 2);
if(err)
{
mutex_lock(&f.lock);
list_del_nreq(&rreq->nreq);
mutex_unlock(&f.lock);
free(rreq);
}
return err;
}
#define FUSE_OPCODE_LEN (FUSE_STATX + 1)
typedef void (*fuse_ll_func)(fuse_req_t*, struct fuse_in_header *);
const
fuse_ll_func
fuse_ll_funcs[FUSE_OPCODE_LEN] =
{
NULL,
do_lookup,
do_forget,
do_getattr,
do_setattr,
do_readlink,
do_symlink,
NULL,
do_mknod,
do_mkdir,
do_unlink,
do_rmdir,
do_rename,
do_link,
do_open,
do_read,
do_write,
do_statfs,
do_release,
NULL,
do_fsync,
do_setxattr,
do_getxattr,
do_listxattr,
do_removexattr,
do_flush,
do_init,
do_opendir,
do_readdir,
do_releasedir,
do_fsyncdir,
do_getlk,
do_setlk,
do_setlkw,
do_access,
do_create,
do_interrupt,
do_bmap,
do_destroy,
do_ioctl,
do_poll,
do_notify_reply,
do_batch_forget,
do_fallocate,
do_readdirplus,
do_rename2,
do_lseek,
do_copy_file_range,
do_setupmapping,
do_removemapping,
do_syncfs,
do_tmpfile,
do_statx
};
#define FUSE_MAXOPS (sizeof(fuse_ll_funcs) / sizeof(fuse_ll_funcs[0]))
static
void
fuse_ll_destroy(void *data)
{
if(f.got_init && !f.got_destroy)
{
if(f.op.destroy)
f.op.destroy(f.userdata);
}
mutex_destroy(&f.lock);
}
static
void
fuse_send_errno(struct fuse_chan *ch_,
const int errno_,
const uint64_t unique_id_)
{
struct fuse_out_header out = {0};
struct iovec iov = {0};
out.unique = unique_id_;
out.error = -errno_;
iov.iov_base = &out;
iov.iov_len = sizeof(struct fuse_out_header);
fuse_send_msg(ch_,&iov,1);
}
static
void
fuse_send_enomem(struct fuse_chan *ch_,
const uint64_t unique_id_)
{
fuse_send_errno(ch_,ENOMEM,unique_id_);
}
static
void
fuse_send_einval(struct fuse_chan *ch_,
const uint64_t unique_id_)
{
fuse_send_errno(ch_,EINVAL,unique_id_);
}
static
int
fuse_ll_buf_receive_read(struct fuse_session *se_,
fuse_msgbuf_t *msgbuf_)
{
int rv;
rv = read(fuse_chan_fd(se_->ch),msgbuf_->mem,msgbuf_->size);
if(rv == -1)
return -errno;
if(rv < (int)sizeof(struct fuse_in_header))
{
fprintf(stderr, "short read from fuse device\n");
return -EIO;
}
return rv;
}
static
void
fuse_ll_buf_process_read(struct fuse_session *se_,
const fuse_msgbuf_t *msgbuf_)
{
int err;
struct fuse_req_t *req;
struct fuse_in_header *in;
in = (struct fuse_in_header*)msgbuf_->mem;
if((in->uid == FUSE_INVALID_UIDGID) || (in->gid == FUSE_INVALID_UIDGID))
return fuse_send_einval(se_->ch,in->unique);
req = fuse_req_alloc();
if(req == NULL)
return fuse_send_enomem(se_->ch,in->unique);
req->ctx.len = in->len;
req->ctx.opcode = in->opcode;
req->ctx.unique = in->unique;
req->ctx.nodeid = in->nodeid;
req->ctx.uid = in->uid;
req->ctx.gid = in->gid;
req->ctx.pid = in->pid;
req->ctx.umask = 0;
req->conn = f.conn;
req->ch = se_->ch;
err = ENOSYS;
if(in->opcode >= FUSE_MAXOPS)
goto reply_err;
if(fuse_ll_funcs[in->opcode] == NULL)
goto reply_err;
fuse_ll_funcs[in->opcode](req, in);
return;
reply_err:
fuse_reply_err(req, err);
return;
}
static
void
fuse_ll_buf_process_read_init(struct fuse_session *se_,
const fuse_msgbuf_t *msgbuf_)
{
int err;
fuse_req_t *req;
struct fuse_in_header *in;
in = (struct fuse_in_header*)msgbuf_->mem;
req = fuse_req_alloc();
if(req == NULL)
return fuse_send_enomem(se_->ch,in->unique);
req->ctx.len = in->len;
req->ctx.opcode = in->opcode;
req->ctx.unique = in->unique;
req->ctx.nodeid = in->nodeid;
req->ctx.uid = in->uid;
req->ctx.gid = in->gid;
req->ctx.pid = in->pid;
req->ctx.umask = 0;
req->conn = f.conn;
req->ch = se_->ch;
err = EIO;
if(in->opcode != FUSE_INIT)
goto reply_err;
if(fuse_ll_funcs[FUSE_INIT] == NULL)
goto reply_err;
se_->process_buf = fuse_ll_buf_process_read;
fuse_ll_funcs[in->opcode](req,in);
return;
reply_err:
fuse_reply_err(req, err);
return;
}
static const struct fuse_opt fuse_ll_opts[] =
{
FUSE_OPT_END
};
static
int
fuse_ll_opt_proc(void *data_,
const char *arg_,
int key_,
struct fuse_args *outargs_)
{
fmt::print(stderr, "* ERROR: unknown option '{}'\n", arg_);
return -1;
}
/*
* always call fuse_lowlevel_new_common() internally, to work around a
* misfeature in the FreeBSD runtime linker, which links the old
* version of a symbol to internal references.
*/
struct fuse_session *
fuse_lowlevel_new_common(struct fuse_args *args,
const struct fuse_lowlevel_ops *op,
size_t op_size,
void *userdata)
{
struct fuse_session *se;
if(sizeof(struct fuse_lowlevel_ops) < op_size)
{
fprintf(stderr, "fuse: warning: library too old, some operations may not work\n");
op_size = sizeof(struct fuse_lowlevel_ops);
}
f = (fuse_ll){0};
list_init_nreq(&f.notify_list);
f.notify_ctr = 1;
mutex_init(&f.lock);
if(fuse_opt_parse(args,NULL,fuse_ll_opts,fuse_ll_opt_proc) == -1)
goto out_free;
f.op = *op;
f.userdata = userdata;
se = fuse_session_new((void*)fuse_ll_buf_receive_read,
(void*)fuse_ll_buf_process_read_init,
(void*)fuse_ll_destroy);
if(!se)
goto out_free;
return se;
out_free:
mutex_destroy(&f.lock);
return NULL;
}
struct fuse_session*
fuse_lowlevel_new(struct fuse_args *args,
const struct fuse_lowlevel_ops *op,
size_t op_size,
void *userdata)
{
return fuse_lowlevel_new_common(args, op, op_size, userdata);
}