mirror of https://github.com/trapexit/mergerfs.git
Antonio SJ Musumeci
4 years ago
6 changed files with 8 additions and 556 deletions
-
1libfuse/Makefile
-
17libfuse/include/Makefile.am
-
87libfuse/include/cuse_lowlevel.h
-
371libfuse/lib/cuse_lowlevel.c
-
3libfuse/lib/fuse_i.h
-
85libfuse/lib/fuse_lowlevel.c
@ -1,17 +0,0 @@ |
|||
## Process this file with automake to produce Makefile.in
|
|||
|
|||
fuseincludedir=$(includedir)/fuse |
|||
|
|||
fuseinclude_HEADERS = \
|
|||
fuse.h \
|
|||
fuse_compat.h \
|
|||
fuse_common.h \
|
|||
fuse_common_compat.h \
|
|||
fuse_lowlevel.h \
|
|||
fuse_lowlevel_compat.h \
|
|||
fuse_opt.h \
|
|||
cuse_lowlevel.h |
|||
|
|||
include_HEADERS = old/fuse.h ulockmgr.h |
|||
|
|||
noinst_HEADERS = fuse_kernel.h |
|||
@ -1,87 +0,0 @@ |
|||
/* |
|||
CUSE: Character device in Userspace |
|||
Copyright (C) 2008-2009 SUSE Linux Products GmbH |
|||
Copyright (C) 2008-2009 Tejun Heo <tj@kernel.org> |
|||
|
|||
This program can be distributed under the terms of the GNU LGPLv2. |
|||
See the file COPYING.LIB. |
|||
|
|||
Read example/cusexmp.c for usages. |
|||
*/ |
|||
|
|||
#ifndef _CUSE_LOWLEVEL_H_ |
|||
#define _CUSE_LOWLEVEL_H_ |
|||
|
|||
#ifndef FUSE_USE_VERSION |
|||
#define FUSE_USE_VERSION 29 |
|||
#endif |
|||
|
|||
#include "fuse_lowlevel.h" |
|||
|
|||
#include <fcntl.h> |
|||
#include <sys/types.h> |
|||
#include <sys/uio.h> |
|||
|
|||
#ifdef __cplusplus |
|||
extern "C" { |
|||
#endif |
|||
|
|||
#define CUSE_UNRESTRICTED_IOCTL (1 << 0) /* use unrestricted ioctl */ |
|||
|
|||
struct fuse_session; |
|||
|
|||
struct cuse_info { |
|||
unsigned dev_major; |
|||
unsigned dev_minor; |
|||
unsigned dev_info_argc; |
|||
const char **dev_info_argv; |
|||
unsigned flags; |
|||
}; |
|||
|
|||
/* |
|||
* Most ops behave almost identically to the matching fuse_lowlevel |
|||
* ops except that they don't take @ino. |
|||
* |
|||
* init_done : called after initialization is complete |
|||
* read/write : always direct IO, simultaneous operations allowed |
|||
* ioctl : might be in unrestricted mode depending on ci->flags |
|||
*/ |
|||
struct cuse_lowlevel_ops { |
|||
void (*init) (void *userdata, struct fuse_conn_info *conn); |
|||
void (*init_done) (void *userdata); |
|||
void (*destroy) (void *userdata); |
|||
void (*open) (fuse_req_t req, struct fuse_file_info *fi); |
|||
void (*read) (fuse_req_t req, size_t size, off_t off, |
|||
struct fuse_file_info *fi); |
|||
void (*write) (fuse_req_t req, const char *buf, size_t size, off_t off, |
|||
struct fuse_file_info *fi); |
|||
void (*flush) (fuse_req_t req, struct fuse_file_info *fi); |
|||
void (*release) (fuse_req_t req, struct fuse_file_info *fi); |
|||
void (*fsync) (fuse_req_t req, int datasync, struct fuse_file_info *fi); |
|||
void (*ioctl) (fuse_req_t req, int cmd, void *arg, |
|||
struct fuse_file_info *fi, unsigned int flags, |
|||
const void *in_buf, size_t in_bufsz, size_t out_bufsz); |
|||
void (*poll) (fuse_req_t req, struct fuse_file_info *fi, |
|||
struct fuse_pollhandle *ph); |
|||
}; |
|||
|
|||
struct fuse_session *cuse_lowlevel_new(struct fuse_args *args, |
|||
const struct cuse_info *ci, |
|||
const struct cuse_lowlevel_ops *clop, |
|||
void *userdata); |
|||
|
|||
struct fuse_session *cuse_lowlevel_setup(int argc, char *argv[], |
|||
const struct cuse_info *ci, |
|||
const struct cuse_lowlevel_ops *clop, |
|||
int *multithreaded, void *userdata); |
|||
|
|||
void cuse_lowlevel_teardown(struct fuse_session *se); |
|||
|
|||
int cuse_lowlevel_main(int argc, char *argv[], const struct cuse_info *ci, |
|||
const struct cuse_lowlevel_ops *clop, void *userdata); |
|||
|
|||
#ifdef __cplusplus |
|||
} |
|||
#endif |
|||
|
|||
#endif /* _CUSE_LOWLEVEL_H_ */ |
|||
@ -1,371 +0,0 @@ |
|||
/* |
|||
CUSE: Character device in Userspace |
|||
Copyright (C) 2008 SUSE Linux Products GmbH |
|||
Copyright (C) 2008 Tejun Heo <teheo@suse.de> |
|||
|
|||
This program can be distributed under the terms of the GNU LGPLv2. |
|||
See the file COPYING.LIB. |
|||
*/ |
|||
|
|||
#include "cuse_lowlevel.h" |
|||
#include "fuse_kernel.h" |
|||
#include "fuse_i.h" |
|||
#include "fuse_opt.h" |
|||
#include "fuse_misc.h" |
|||
|
|||
#include <stdio.h> |
|||
#include <string.h> |
|||
#include <stdlib.h> |
|||
#include <stddef.h> |
|||
#include <errno.h> |
|||
#include <unistd.h> |
|||
|
|||
struct cuse_data { |
|||
struct cuse_lowlevel_ops clop; |
|||
unsigned max_read; |
|||
unsigned dev_major; |
|||
unsigned dev_minor; |
|||
unsigned flags; |
|||
unsigned dev_info_len; |
|||
char dev_info[]; |
|||
}; |
|||
|
|||
static struct cuse_lowlevel_ops *req_clop(fuse_req_t req) |
|||
{ |
|||
return &req->f->cuse_data->clop; |
|||
} |
|||
|
|||
static void cuse_fll_open(fuse_req_t req, fuse_ino_t ino, |
|||
struct fuse_file_info *fi) |
|||
{ |
|||
(void)ino; |
|||
req_clop(req)->open(req, fi); |
|||
} |
|||
|
|||
static void cuse_fll_read(fuse_req_t req, fuse_ino_t ino, size_t size, |
|||
off_t off, struct fuse_file_info *fi) |
|||
{ |
|||
(void)ino; |
|||
req_clop(req)->read(req, size, off, fi); |
|||
} |
|||
|
|||
static void cuse_fll_write(fuse_req_t req, fuse_ino_t ino, const char *buf, |
|||
size_t size, off_t off, struct fuse_file_info *fi) |
|||
{ |
|||
(void)ino; |
|||
req_clop(req)->write(req, buf, size, off, fi); |
|||
} |
|||
|
|||
static void cuse_fll_flush(fuse_req_t req, fuse_ino_t ino, |
|||
struct fuse_file_info *fi) |
|||
{ |
|||
(void)ino; |
|||
req_clop(req)->flush(req, fi); |
|||
} |
|||
|
|||
static void cuse_fll_release(fuse_req_t req, fuse_ino_t ino, |
|||
struct fuse_file_info *fi) |
|||
{ |
|||
(void)ino; |
|||
req_clop(req)->release(req, fi); |
|||
} |
|||
|
|||
static void cuse_fll_fsync(fuse_req_t req, fuse_ino_t ino, int datasync, |
|||
struct fuse_file_info *fi) |
|||
{ |
|||
(void)ino; |
|||
req_clop(req)->fsync(req, datasync, fi); |
|||
} |
|||
|
|||
static void cuse_fll_ioctl(fuse_req_t req, fuse_ino_t ino, int cmd, void *arg, |
|||
struct fuse_file_info *fi, unsigned int flags, |
|||
const void *in_buf, size_t in_bufsz, size_t out_bufsz) |
|||
{ |
|||
(void)ino; |
|||
req_clop(req)->ioctl(req, cmd, arg, fi, flags, in_buf, in_bufsz, |
|||
out_bufsz); |
|||
} |
|||
|
|||
static void cuse_fll_poll(fuse_req_t req, fuse_ino_t ino, |
|||
struct fuse_file_info *fi, struct fuse_pollhandle *ph) |
|||
{ |
|||
(void)ino; |
|||
req_clop(req)->poll(req, fi, ph); |
|||
} |
|||
|
|||
static size_t cuse_pack_info(int argc, const char **argv, char *buf) |
|||
{ |
|||
size_t size = 0; |
|||
int i; |
|||
|
|||
for (i = 0; i < argc; i++) { |
|||
size_t len; |
|||
|
|||
len = strlen(argv[i]) + 1; |
|||
size += len; |
|||
if (buf) { |
|||
memcpy(buf, argv[i], len); |
|||
buf += len; |
|||
} |
|||
} |
|||
|
|||
return size; |
|||
} |
|||
|
|||
static struct cuse_data *cuse_prep_data(const struct cuse_info *ci, |
|||
const struct cuse_lowlevel_ops *clop) |
|||
{ |
|||
struct cuse_data *cd; |
|||
size_t dev_info_len; |
|||
|
|||
dev_info_len = cuse_pack_info(ci->dev_info_argc, ci->dev_info_argv, |
|||
NULL); |
|||
|
|||
if (dev_info_len > CUSE_INIT_INFO_MAX) { |
|||
fprintf(stderr, "cuse: dev_info (%zu) too large, limit=%u\n", |
|||
dev_info_len, CUSE_INIT_INFO_MAX); |
|||
return NULL; |
|||
} |
|||
|
|||
cd = calloc(1, sizeof(*cd) + dev_info_len); |
|||
if (!cd) { |
|||
fprintf(stderr, "cuse: failed to allocate cuse_data\n"); |
|||
return NULL; |
|||
} |
|||
|
|||
memcpy(&cd->clop, clop, sizeof(cd->clop)); |
|||
cd->max_read = 131072; |
|||
cd->dev_major = ci->dev_major; |
|||
cd->dev_minor = ci->dev_minor; |
|||
cd->dev_info_len = dev_info_len; |
|||
cd->flags = ci->flags; |
|||
cuse_pack_info(ci->dev_info_argc, ci->dev_info_argv, cd->dev_info); |
|||
|
|||
return cd; |
|||
} |
|||
|
|||
struct fuse_session *cuse_lowlevel_new(struct fuse_args *args, |
|||
const struct cuse_info *ci, |
|||
const struct cuse_lowlevel_ops *clop, |
|||
void *userdata) |
|||
{ |
|||
struct fuse_lowlevel_ops lop; |
|||
struct cuse_data *cd; |
|||
struct fuse_session *se; |
|||
struct fuse_ll *ll; |
|||
|
|||
cd = cuse_prep_data(ci, clop); |
|||
if (!cd) |
|||
return NULL; |
|||
|
|||
memset(&lop, 0, sizeof(lop)); |
|||
lop.init = clop->init; |
|||
lop.destroy = clop->destroy; |
|||
lop.open = clop->open ? cuse_fll_open : NULL; |
|||
lop.read = clop->read ? cuse_fll_read : NULL; |
|||
lop.write = clop->write ? cuse_fll_write : NULL; |
|||
lop.flush = clop->flush ? cuse_fll_flush : NULL; |
|||
lop.release = clop->release ? cuse_fll_release : NULL; |
|||
lop.fsync = clop->fsync ? cuse_fll_fsync : NULL; |
|||
lop.ioctl = clop->ioctl ? cuse_fll_ioctl : NULL; |
|||
lop.poll = clop->poll ? cuse_fll_poll : NULL; |
|||
|
|||
se = fuse_lowlevel_new_common(args, &lop, sizeof(lop), userdata); |
|||
if (!se) { |
|||
free(cd); |
|||
return NULL; |
|||
} |
|||
ll = se->data; |
|||
ll->cuse_data = cd; |
|||
|
|||
return se; |
|||
} |
|||
|
|||
static int cuse_reply_init(fuse_req_t req, struct cuse_init_out *arg, |
|||
char *dev_info, unsigned dev_info_len) |
|||
{ |
|||
struct iovec iov[3]; |
|||
|
|||
iov[1].iov_base = arg; |
|||
iov[1].iov_len = sizeof(struct cuse_init_out); |
|||
iov[2].iov_base = dev_info; |
|||
iov[2].iov_len = dev_info_len; |
|||
|
|||
return fuse_send_reply_iov_nofree(req, 0, iov, 3); |
|||
} |
|||
|
|||
void cuse_lowlevel_init(fuse_req_t req, fuse_ino_t nodeid, const void *inarg) |
|||
{ |
|||
struct fuse_init_in *arg = (struct fuse_init_in *) inarg; |
|||
struct cuse_init_out outarg; |
|||
struct fuse_ll *f = req->f; |
|||
struct cuse_data *cd = f->cuse_data; |
|||
size_t bufsize = fuse_chan_bufsize(req->ch); |
|||
struct cuse_lowlevel_ops *clop = req_clop(req); |
|||
|
|||
(void) nodeid; |
|||
if (f->debug) { |
|||
fprintf(stderr, "CUSE_INIT: %u.%u\n", arg->major, arg->minor); |
|||
fprintf(stderr, "flags=0x%08x\n", arg->flags); |
|||
} |
|||
f->conn.proto_major = arg->major; |
|||
f->conn.proto_minor = arg->minor; |
|||
f->conn.capable = 0; |
|||
f->conn.want = 0; |
|||
|
|||
if (arg->major < 7) { |
|||
fprintf(stderr, "cuse: unsupported protocol version: %u.%u\n", |
|||
arg->major, arg->minor); |
|||
fuse_reply_err(req, EPROTO); |
|||
return; |
|||
} |
|||
|
|||
if (bufsize < FUSE_MIN_READ_BUFFER) { |
|||
fprintf(stderr, "cuse: warning: buffer size too small: %zu\n", |
|||
bufsize); |
|||
bufsize = FUSE_MIN_READ_BUFFER; |
|||
} |
|||
|
|||
bufsize -= 4096; |
|||
if (bufsize < f->conn.max_write) |
|||
f->conn.max_write = bufsize; |
|||
|
|||
f->got_init = 1; |
|||
if (f->op.init) |
|||
f->op.init(f->userdata, &f->conn); |
|||
|
|||
memset(&outarg, 0, sizeof(outarg)); |
|||
outarg.major = FUSE_KERNEL_VERSION; |
|||
outarg.minor = FUSE_KERNEL_MINOR_VERSION; |
|||
outarg.flags = cd->flags; |
|||
outarg.max_read = cd->max_read; |
|||
outarg.max_write = f->conn.max_write; |
|||
outarg.dev_major = cd->dev_major; |
|||
outarg.dev_minor = cd->dev_minor; |
|||
|
|||
if (f->debug) { |
|||
fprintf(stderr, " CUSE_INIT: %u.%u\n", |
|||
outarg.major, outarg.minor); |
|||
fprintf(stderr, " flags=0x%08x\n", outarg.flags); |
|||
fprintf(stderr, " max_read=0x%08x\n", outarg.max_read); |
|||
fprintf(stderr, " max_write=0x%08x\n", outarg.max_write); |
|||
fprintf(stderr, " dev_major=%u\n", outarg.dev_major); |
|||
fprintf(stderr, " dev_minor=%u\n", outarg.dev_minor); |
|||
fprintf(stderr, " dev_info: %.*s\n", cd->dev_info_len, |
|||
cd->dev_info); |
|||
} |
|||
|
|||
cuse_reply_init(req, &outarg, cd->dev_info, cd->dev_info_len); |
|||
|
|||
if (clop->init_done) |
|||
clop->init_done(f->userdata); |
|||
|
|||
fuse_free_req(req); |
|||
} |
|||
|
|||
struct fuse_session *cuse_lowlevel_setup(int argc, char *argv[], |
|||
const struct cuse_info *ci, |
|||
const struct cuse_lowlevel_ops *clop, |
|||
int *multithreaded, void *userdata) |
|||
{ |
|||
const char *devname = "/dev/cuse"; |
|||
static const struct fuse_opt kill_subtype_opts[] = { |
|||
FUSE_OPT_KEY("subtype=", FUSE_OPT_KEY_DISCARD), |
|||
FUSE_OPT_END |
|||
}; |
|||
struct fuse_args args = FUSE_ARGS_INIT(argc, argv); |
|||
struct fuse_session *se; |
|||
struct fuse_chan *ch; |
|||
int fd; |
|||
int foreground; |
|||
int res; |
|||
|
|||
res = fuse_parse_cmdline(&args, NULL, multithreaded, &foreground); |
|||
if (res == -1) |
|||
goto err_args; |
|||
|
|||
res = fuse_opt_parse(&args, NULL, kill_subtype_opts, NULL); |
|||
if (res == -1) |
|||
goto err_args; |
|||
|
|||
/* |
|||
* Make sure file descriptors 0, 1 and 2 are open, otherwise chaos |
|||
* would ensue. |
|||
*/ |
|||
do { |
|||
fd = open("/dev/null", O_RDWR); |
|||
if (fd > 2) |
|||
close(fd); |
|||
} while (fd >= 0 && fd <= 2); |
|||
|
|||
se = cuse_lowlevel_new(&args, ci, clop, userdata); |
|||
fuse_opt_free_args(&args); |
|||
if (se == NULL) |
|||
goto err_args; |
|||
|
|||
fd = open(devname, O_RDWR); |
|||
if (fd == -1) { |
|||
if (errno == ENODEV || errno == ENOENT) |
|||
fprintf(stderr, "cuse: device not found, try 'modprobe cuse' first\n"); |
|||
else |
|||
fprintf(stderr, "cuse: failed to open %s: %s\n", |
|||
devname, strerror(errno)); |
|||
goto err_se; |
|||
} |
|||
|
|||
ch = fuse_kern_chan_new(fd); |
|||
if (!ch) { |
|||
close(fd); |
|||
goto err_se; |
|||
} |
|||
|
|||
fuse_session_add_chan(se, ch); |
|||
|
|||
res = fuse_set_signal_handlers(se); |
|||
if (res == -1) |
|||
goto err_se; |
|||
|
|||
res = fuse_daemonize(foreground); |
|||
if (res == -1) |
|||
goto err_sig; |
|||
|
|||
return se; |
|||
|
|||
err_sig: |
|||
fuse_remove_signal_handlers(se); |
|||
err_se: |
|||
fuse_session_destroy(se); |
|||
err_args: |
|||
fuse_opt_free_args(&args); |
|||
return NULL; |
|||
} |
|||
|
|||
void cuse_lowlevel_teardown(struct fuse_session *se) |
|||
{ |
|||
fuse_remove_signal_handlers(se); |
|||
fuse_session_destroy(se); |
|||
} |
|||
|
|||
int cuse_lowlevel_main(int argc, char *argv[], const struct cuse_info *ci, |
|||
const struct cuse_lowlevel_ops *clop, void *userdata) |
|||
{ |
|||
struct fuse_session *se; |
|||
int multithreaded; |
|||
int res; |
|||
|
|||
se = cuse_lowlevel_setup(argc, argv, ci, clop, &multithreaded, |
|||
userdata); |
|||
if (se == NULL) |
|||
return 1; |
|||
|
|||
if (multithreaded) |
|||
res = fuse_session_loop_mt(se, 0); |
|||
else |
|||
res = fuse_session_loop(se); |
|||
|
|||
cuse_lowlevel_teardown(se); |
|||
if (res == -1) |
|||
return 1; |
|||
|
|||
return 0; |
|||
} |
|||
Write
Preview
Loading…
Cancel
Save
Reference in new issue