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
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17libfuse/include/Makefile.am
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87libfuse/include/cuse_lowlevel.h
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371libfuse/lib/cuse_lowlevel.c
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3libfuse/lib/fuse_i.h
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79libfuse/lib/fuse_lowlevel.c
@ -1,17 +0,0 @@ |
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## Process this file with automake to produce Makefile.in
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fuseincludedir=$(includedir)/fuse |
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fuseinclude_HEADERS = \
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fuse.h \
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fuse_compat.h \
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fuse_common.h \
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fuse_common_compat.h \
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fuse_lowlevel.h \
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fuse_lowlevel_compat.h \
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fuse_opt.h \
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cuse_lowlevel.h |
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include_HEADERS = old/fuse.h ulockmgr.h |
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noinst_HEADERS = fuse_kernel.h |
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@ -1,87 +0,0 @@ |
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/* |
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CUSE: Character device in Userspace |
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Copyright (C) 2008-2009 SUSE Linux Products GmbH |
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Copyright (C) 2008-2009 Tejun Heo <tj@kernel.org> |
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This program can be distributed under the terms of the GNU LGPLv2. |
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See the file COPYING.LIB. |
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Read example/cusexmp.c for usages. |
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*/ |
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#ifndef _CUSE_LOWLEVEL_H_ |
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#define _CUSE_LOWLEVEL_H_ |
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#ifndef FUSE_USE_VERSION |
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#define FUSE_USE_VERSION 29 |
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#endif |
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#include "fuse_lowlevel.h" |
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#include <fcntl.h> |
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#include <sys/types.h> |
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#include <sys/uio.h> |
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#ifdef __cplusplus |
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extern "C" { |
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#endif |
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#define CUSE_UNRESTRICTED_IOCTL (1 << 0) /* use unrestricted ioctl */ |
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struct fuse_session; |
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struct cuse_info { |
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unsigned dev_major; |
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unsigned dev_minor; |
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unsigned dev_info_argc; |
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const char **dev_info_argv; |
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unsigned flags; |
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}; |
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/* |
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* Most ops behave almost identically to the matching fuse_lowlevel |
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* ops except that they don't take @ino. |
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* |
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* init_done : called after initialization is complete |
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* read/write : always direct IO, simultaneous operations allowed |
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* ioctl : might be in unrestricted mode depending on ci->flags |
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*/ |
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struct cuse_lowlevel_ops { |
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void (*init) (void *userdata, struct fuse_conn_info *conn); |
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void (*init_done) (void *userdata); |
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void (*destroy) (void *userdata); |
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void (*open) (fuse_req_t req, struct fuse_file_info *fi); |
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void (*read) (fuse_req_t req, size_t size, off_t off, |
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struct fuse_file_info *fi); |
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void (*write) (fuse_req_t req, const char *buf, size_t size, off_t off, |
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struct fuse_file_info *fi); |
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void (*flush) (fuse_req_t req, struct fuse_file_info *fi); |
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void (*release) (fuse_req_t req, struct fuse_file_info *fi); |
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void (*fsync) (fuse_req_t req, int datasync, struct fuse_file_info *fi); |
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void (*ioctl) (fuse_req_t req, int cmd, void *arg, |
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struct fuse_file_info *fi, unsigned int flags, |
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const void *in_buf, size_t in_bufsz, size_t out_bufsz); |
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void (*poll) (fuse_req_t req, struct fuse_file_info *fi, |
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struct fuse_pollhandle *ph); |
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}; |
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struct fuse_session *cuse_lowlevel_new(struct fuse_args *args, |
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const struct cuse_info *ci, |
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const struct cuse_lowlevel_ops *clop, |
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void *userdata); |
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struct fuse_session *cuse_lowlevel_setup(int argc, char *argv[], |
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const struct cuse_info *ci, |
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const struct cuse_lowlevel_ops *clop, |
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int *multithreaded, void *userdata); |
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void cuse_lowlevel_teardown(struct fuse_session *se); |
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int cuse_lowlevel_main(int argc, char *argv[], const struct cuse_info *ci, |
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const struct cuse_lowlevel_ops *clop, void *userdata); |
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#ifdef __cplusplus |
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} |
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#endif |
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#endif /* _CUSE_LOWLEVEL_H_ */ |
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@ -1,371 +0,0 @@ |
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/* |
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CUSE: Character device in Userspace |
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Copyright (C) 2008 SUSE Linux Products GmbH |
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Copyright (C) 2008 Tejun Heo <teheo@suse.de> |
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This program can be distributed under the terms of the GNU LGPLv2. |
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See the file COPYING.LIB. |
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*/ |
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#include "cuse_lowlevel.h" |
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#include "fuse_kernel.h" |
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#include "fuse_i.h" |
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#include "fuse_opt.h" |
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#include "fuse_misc.h" |
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#include <stdio.h> |
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#include <string.h> |
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#include <stdlib.h> |
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#include <stddef.h> |
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#include <errno.h> |
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#include <unistd.h> |
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struct cuse_data { |
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struct cuse_lowlevel_ops clop; |
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unsigned max_read; |
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unsigned dev_major; |
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unsigned dev_minor; |
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unsigned flags; |
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unsigned dev_info_len; |
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char dev_info[]; |
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}; |
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static struct cuse_lowlevel_ops *req_clop(fuse_req_t req) |
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{ |
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return &req->f->cuse_data->clop; |
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} |
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static void cuse_fll_open(fuse_req_t req, fuse_ino_t ino, |
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struct fuse_file_info *fi) |
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{ |
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(void)ino; |
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req_clop(req)->open(req, fi); |
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} |
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static void cuse_fll_read(fuse_req_t req, fuse_ino_t ino, size_t size, |
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off_t off, struct fuse_file_info *fi) |
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{ |
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(void)ino; |
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req_clop(req)->read(req, size, off, fi); |
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} |
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static void cuse_fll_write(fuse_req_t req, fuse_ino_t ino, const char *buf, |
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size_t size, off_t off, struct fuse_file_info *fi) |
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{ |
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(void)ino; |
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req_clop(req)->write(req, buf, size, off, fi); |
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} |
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static void cuse_fll_flush(fuse_req_t req, fuse_ino_t ino, |
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struct fuse_file_info *fi) |
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{ |
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(void)ino; |
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req_clop(req)->flush(req, fi); |
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} |
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static void cuse_fll_release(fuse_req_t req, fuse_ino_t ino, |
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struct fuse_file_info *fi) |
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{ |
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(void)ino; |
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req_clop(req)->release(req, fi); |
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} |
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static void cuse_fll_fsync(fuse_req_t req, fuse_ino_t ino, int datasync, |
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struct fuse_file_info *fi) |
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{ |
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(void)ino; |
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req_clop(req)->fsync(req, datasync, fi); |
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} |
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static void cuse_fll_ioctl(fuse_req_t req, fuse_ino_t ino, int cmd, void *arg, |
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struct fuse_file_info *fi, unsigned int flags, |
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const void *in_buf, size_t in_bufsz, size_t out_bufsz) |
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{ |
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(void)ino; |
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req_clop(req)->ioctl(req, cmd, arg, fi, flags, in_buf, in_bufsz, |
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out_bufsz); |
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} |
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static void cuse_fll_poll(fuse_req_t req, fuse_ino_t ino, |
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struct fuse_file_info *fi, struct fuse_pollhandle *ph) |
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{ |
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(void)ino; |
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req_clop(req)->poll(req, fi, ph); |
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} |
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static size_t cuse_pack_info(int argc, const char **argv, char *buf) |
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{ |
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size_t size = 0; |
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int i; |
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for (i = 0; i < argc; i++) { |
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size_t len; |
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len = strlen(argv[i]) + 1; |
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size += len; |
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if (buf) { |
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memcpy(buf, argv[i], len); |
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buf += len; |
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} |
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} |
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return size; |
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} |
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static struct cuse_data *cuse_prep_data(const struct cuse_info *ci, |
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const struct cuse_lowlevel_ops *clop) |
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{ |
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struct cuse_data *cd; |
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size_t dev_info_len; |
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dev_info_len = cuse_pack_info(ci->dev_info_argc, ci->dev_info_argv, |
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NULL); |
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if (dev_info_len > CUSE_INIT_INFO_MAX) { |
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fprintf(stderr, "cuse: dev_info (%zu) too large, limit=%u\n", |
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dev_info_len, CUSE_INIT_INFO_MAX); |
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return NULL; |
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} |
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cd = calloc(1, sizeof(*cd) + dev_info_len); |
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if (!cd) { |
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fprintf(stderr, "cuse: failed to allocate cuse_data\n"); |
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return NULL; |
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} |
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memcpy(&cd->clop, clop, sizeof(cd->clop)); |
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cd->max_read = 131072; |
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cd->dev_major = ci->dev_major; |
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cd->dev_minor = ci->dev_minor; |
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cd->dev_info_len = dev_info_len; |
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cd->flags = ci->flags; |
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cuse_pack_info(ci->dev_info_argc, ci->dev_info_argv, cd->dev_info); |
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return cd; |
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} |
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struct fuse_session *cuse_lowlevel_new(struct fuse_args *args, |
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const struct cuse_info *ci, |
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const struct cuse_lowlevel_ops *clop, |
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void *userdata) |
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{ |
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struct fuse_lowlevel_ops lop; |
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struct cuse_data *cd; |
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struct fuse_session *se; |
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struct fuse_ll *ll; |
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cd = cuse_prep_data(ci, clop); |
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if (!cd) |
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return NULL; |
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memset(&lop, 0, sizeof(lop)); |
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lop.init = clop->init; |
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lop.destroy = clop->destroy; |
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lop.open = clop->open ? cuse_fll_open : NULL; |
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lop.read = clop->read ? cuse_fll_read : NULL; |
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lop.write = clop->write ? cuse_fll_write : NULL; |
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lop.flush = clop->flush ? cuse_fll_flush : NULL; |
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lop.release = clop->release ? cuse_fll_release : NULL; |
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lop.fsync = clop->fsync ? cuse_fll_fsync : NULL; |
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lop.ioctl = clop->ioctl ? cuse_fll_ioctl : NULL; |
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lop.poll = clop->poll ? cuse_fll_poll : NULL; |
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se = fuse_lowlevel_new_common(args, &lop, sizeof(lop), userdata); |
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if (!se) { |
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free(cd); |
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return NULL; |
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} |
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ll = se->data; |
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ll->cuse_data = cd; |
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return se; |
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} |
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static int cuse_reply_init(fuse_req_t req, struct cuse_init_out *arg, |
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char *dev_info, unsigned dev_info_len) |
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{ |
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struct iovec iov[3]; |
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iov[1].iov_base = arg; |
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iov[1].iov_len = sizeof(struct cuse_init_out); |
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iov[2].iov_base = dev_info; |
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iov[2].iov_len = dev_info_len; |
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return fuse_send_reply_iov_nofree(req, 0, iov, 3); |
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} |
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void cuse_lowlevel_init(fuse_req_t req, fuse_ino_t nodeid, const void *inarg) |
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{ |
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struct fuse_init_in *arg = (struct fuse_init_in *) inarg; |
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struct cuse_init_out outarg; |
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struct fuse_ll *f = req->f; |
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struct cuse_data *cd = f->cuse_data; |
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size_t bufsize = fuse_chan_bufsize(req->ch); |
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struct cuse_lowlevel_ops *clop = req_clop(req); |
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(void) nodeid; |
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if (f->debug) { |
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fprintf(stderr, "CUSE_INIT: %u.%u\n", arg->major, arg->minor); |
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fprintf(stderr, "flags=0x%08x\n", arg->flags); |
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} |
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f->conn.proto_major = arg->major; |
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f->conn.proto_minor = arg->minor; |
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f->conn.capable = 0; |
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f->conn.want = 0; |
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if (arg->major < 7) { |
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fprintf(stderr, "cuse: unsupported protocol version: %u.%u\n", |
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arg->major, arg->minor); |
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fuse_reply_err(req, EPROTO); |
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return; |
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} |
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if (bufsize < FUSE_MIN_READ_BUFFER) { |
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fprintf(stderr, "cuse: warning: buffer size too small: %zu\n", |
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bufsize); |
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bufsize = FUSE_MIN_READ_BUFFER; |
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} |
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bufsize -= 4096; |
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if (bufsize < f->conn.max_write) |
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f->conn.max_write = bufsize; |
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f->got_init = 1; |
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if (f->op.init) |
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f->op.init(f->userdata, &f->conn); |
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memset(&outarg, 0, sizeof(outarg)); |
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outarg.major = FUSE_KERNEL_VERSION; |
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outarg.minor = FUSE_KERNEL_MINOR_VERSION; |
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outarg.flags = cd->flags; |
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outarg.max_read = cd->max_read; |
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outarg.max_write = f->conn.max_write; |
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outarg.dev_major = cd->dev_major; |
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outarg.dev_minor = cd->dev_minor; |
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if (f->debug) { |
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fprintf(stderr, " CUSE_INIT: %u.%u\n", |
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outarg.major, outarg.minor); |
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fprintf(stderr, " flags=0x%08x\n", outarg.flags); |
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fprintf(stderr, " max_read=0x%08x\n", outarg.max_read); |
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fprintf(stderr, " max_write=0x%08x\n", outarg.max_write); |
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fprintf(stderr, " dev_major=%u\n", outarg.dev_major); |
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fprintf(stderr, " dev_minor=%u\n", outarg.dev_minor); |
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fprintf(stderr, " dev_info: %.*s\n", cd->dev_info_len, |
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cd->dev_info); |
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} |
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cuse_reply_init(req, &outarg, cd->dev_info, cd->dev_info_len); |
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if (clop->init_done) |
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clop->init_done(f->userdata); |
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fuse_free_req(req); |
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} |
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struct fuse_session *cuse_lowlevel_setup(int argc, char *argv[], |
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const struct cuse_info *ci, |
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const struct cuse_lowlevel_ops *clop, |
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int *multithreaded, void *userdata) |
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{ |
|
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const char *devname = "/dev/cuse"; |
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static const struct fuse_opt kill_subtype_opts[] = { |
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FUSE_OPT_KEY("subtype=", FUSE_OPT_KEY_DISCARD), |
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FUSE_OPT_END |
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}; |
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struct fuse_args args = FUSE_ARGS_INIT(argc, argv); |
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struct fuse_session *se; |
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struct fuse_chan *ch; |
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int fd; |
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int foreground; |
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int res; |
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res = fuse_parse_cmdline(&args, NULL, multithreaded, &foreground); |
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if (res == -1) |
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goto err_args; |
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res = fuse_opt_parse(&args, NULL, kill_subtype_opts, NULL); |
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if (res == -1) |
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goto err_args; |
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/* |
|
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* Make sure file descriptors 0, 1 and 2 are open, otherwise chaos |
|
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* would ensue. |
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*/ |
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do { |
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fd = open("/dev/null", O_RDWR); |
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if (fd > 2) |
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close(fd); |
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} while (fd >= 0 && fd <= 2); |
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se = cuse_lowlevel_new(&args, ci, clop, userdata); |
|
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fuse_opt_free_args(&args); |
|
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if (se == NULL) |
|
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goto err_args; |
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|
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fd = open(devname, O_RDWR); |
|
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if (fd == -1) { |
|
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if (errno == ENODEV || errno == ENOENT) |
|
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fprintf(stderr, "cuse: device not found, try 'modprobe cuse' first\n"); |
|
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else |
|
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fprintf(stderr, "cuse: failed to open %s: %s\n", |
|
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devname, strerror(errno)); |
|
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goto err_se; |
|
||||
} |
|
||||
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|
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ch = fuse_kern_chan_new(fd); |
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if (!ch) { |
|
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close(fd); |
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goto err_se; |
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} |
|
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|
|
||||
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; |
|
||||
} |
|
||||
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