Add a simple FUSE filesystem based on libnfs.
Ronnie Sahlberg
parent
558aefc736
commit
c6bd90a235
8
README
8
README
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@ -47,6 +47,14 @@ This is highly non-portable so IF this works on your linux system, count
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yourself lucky.
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FUSE
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====
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A simple FUSE filesystem built on libnfs can be found in
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examples/fuse_nfs.c
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Compile using : gcc fuse_nfs.c -o fuse_nfs -lfuse -lnfs
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Mount using : sudo ./fuse_nfs -n nfs://<server>/<export> -m <mountpoint>
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PLATFORM support
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=================
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@ -0,0 +1,325 @@
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/*
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Copyright (C) by Ronnie Sahlberg <ronniesahlberg@gmail.com> 2013
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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/* A FUSE filesystem based on libnfs. */
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#define FUSE_USE_VERSION 26
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#define _FILE_OFFSET_BITS 64
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#include <fuse.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <getopt.h>
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#include <nfsc/libnfs.h>
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#define discard_const(ptr) ((void *)((intptr_t)(ptr)))
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FILE *fh=NULL;
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struct nfs_context *nfs = NULL;
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static int fuse_nfs_getattr(const char *path, struct stat *stbuf)
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{
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int ret = 0;
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memset(stbuf, 0, sizeof(struct stat));
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ret = nfs_stat(nfs, path, stbuf);
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return ret;
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}
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static int fuse_nfs_readdir(const char *path, void *buf, fuse_fill_dir_t filler,
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off_t offset, struct fuse_file_info *fi)
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{
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struct nfsdir *nfsdir;
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struct nfsdirent *nfsdirent;
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int ret = 0;
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ret = nfs_opendir(nfs, path, &nfsdir);
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if (ret < 0) {
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return ret;
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}
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while ((nfsdirent = nfs_readdir(nfs, nfsdir)) != NULL) {
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filler(buf, nfsdirent->name, NULL, 0);
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}
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return ret;
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}
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static int fuse_nfs_open(const char *path, struct fuse_file_info *fi)
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{
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int ret = 0;
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struct nfsfh *nfsfh;
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fi->fh = 0;
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ret = nfs_open(nfs, path, fi->flags, &nfsfh);
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if (ret < 0) {
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return ret;
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}
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fi->fh = (uint64_t)nfsfh;
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return ret;
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}
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static int fuse_nfs_release(const char *path, struct fuse_file_info *fi)
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{
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struct nfsfh *nfsfh = (struct nfsfh *)fi->fh;
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nfs_close(nfs, nfsfh);
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return 0;
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}
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static int fuse_nfs_read(const char *path, char *buf, size_t size,
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off_t offset, struct fuse_file_info *fi)
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{
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int ret = 0;
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struct nfsfh *nfsfh = (struct nfsfh *)fi->fh;
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ret = nfs_pread(nfs, nfsfh, offset, size, buf);
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return ret;
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}
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static int fuse_nfs_write(const char *path, const char *buf, size_t size,
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off_t offset, struct fuse_file_info *fi)
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{
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int ret = 0;
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struct nfsfh *nfsfh = (struct nfsfh *)fi->fh;
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ret = nfs_pwrite(nfs, nfsfh, offset, size, discard_const(buf));
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return ret;
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}
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static int fuse_nfs_create(const char *path, mode_t mode, struct fuse_file_info *fi)
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{
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int ret = 0;
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struct nfsfh *nfsfh;
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ret = nfs_creat(nfs, path, mode, &nfsfh);
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if (ret < 0) {
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return ret;
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}
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fi->fh = (uint64_t)nfsfh;
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//nfs_chown
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return ret;
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}
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static int fuse_nfs_utime(const char *path, struct utimbuf *times)
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{
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int ret = 0;
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ret = nfs_utime(nfs, path, times);
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if (ret < 0) {
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return ret;
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}
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return ret;
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}
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static int fuse_nfs_unlink(const char *path)
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{
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int ret = 0;
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ret = nfs_unlink(nfs, path);
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if (ret < 0) {
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return ret;
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}
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return ret;
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}
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static int fuse_nfs_rmdir(const char *path)
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{
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int ret = 0;
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ret = nfs_rmdir(nfs, path);
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if (ret < 0) {
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return ret;
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}
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return ret;
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}
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static int fuse_nfs_mkdir(const char *path, mode_t mode)
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{
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int ret = 0;
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ret = nfs_mkdir(nfs, path);
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if (ret < 0) {
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return ret;
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}
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ret = nfs_chmod(nfs, path, mode);
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if (ret < 0) {
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return ret;
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}
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return ret;
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}
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static struct fuse_operations nfs_oper = {
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.create = fuse_nfs_create,
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.getattr = fuse_nfs_getattr,
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.mkdir = fuse_nfs_mkdir,
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.open = fuse_nfs_open,
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.read = fuse_nfs_read,
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.readdir = fuse_nfs_readdir,
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.release = fuse_nfs_release,
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.rmdir = fuse_nfs_rmdir,
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.unlink = fuse_nfs_unlink,
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.utime = fuse_nfs_utime,
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.write = fuse_nfs_write,
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};
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void print_usage(char *name)
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{
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printf("Usage: %s [-?|--help] [-n|--nfs-share=nfs-url] mountpoint\n",
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name);
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exit(0);
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}
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int main(int argc, char *argv[])
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{
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int ret = 0;
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static struct option long_opts[] = {
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{ "help", no_argument, 0, '?' },
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{ "nfs-share", required_argument, 0, 'n' },
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{ "mountpoint", required_argument, 0, 'm' },
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{ NULL, 0, 0, 0 }
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};
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int c;
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int opt_idx = 0;
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char *url = NULL;
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char *mnt = NULL;
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char *server = NULL, *export = NULL, *strp;
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int fuse_nfs_argc = 6;
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char *fuse_nfs_argv[16] = {
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"fuse-nfs",
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"<export>",
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"-odebug",
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"-oallow_other",
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"-odefault_permissions",
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"-omax_write=32768",
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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};
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while ((c = getopt_long(argc, argv, "?hm:n:", long_opts,
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&opt_idx)) > 0) {
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switch (c) {
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case 'h':
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case '?':
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print_usage(argv[0]);
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return 0;
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case 'm':
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mnt = strdup(optarg);
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break;
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case 'n':
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url = strdup(optarg);
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break;
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}
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}
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if (url == NULL) {
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fprintf(stderr, "-n was not specified.\n");
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ret = 10;
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goto finished;
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}
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if (mnt == NULL) {
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fprintf(stderr, "-m was not specified.\n");
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ret = 10;
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goto finished;
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}
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if (strncmp(url, "nfs://", 6)) {
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fprintf(stderr, "Invalid URL specified.\n");
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ret = 10;
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goto finished;
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}
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server = strdup(url + 6);
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if (server == NULL) {
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fprintf(stderr, "Failed to strdup server string\n");
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ret = 10;
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goto finished;
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}
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if (server[0] == '/' || server[0] == '\0') {
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fprintf(stderr, "Invalid server string.\n");
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ret = 10;
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goto finished;
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}
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strp = strchr(server, '/');
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if (strp == NULL) {
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fprintf(stderr, "Invalid URL specified.\n");
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ret = 10;
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goto finished;
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}
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export = strdup(strp);
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if (export == NULL) {
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fprintf(stderr, "Failed to strdup server string\n");
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ret = 10;
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goto finished;
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}
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if (export[0] != '/') {
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fprintf(stderr, "Invalid export.\n");
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ret = 10;
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goto finished;
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}
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*strp = 0;
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nfs = nfs_init_context();
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if (nfs == NULL) {
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printf("failed to init context\n");
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goto finished;
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}
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ret = nfs_mount(nfs, server, export);
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if (ret != 0) {
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printf("Failed to mount nfs share : %s\n", nfs_get_error(nfs));
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goto finished;
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}
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fuse_nfs_argv[1] = mnt;
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return fuse_main(fuse_nfs_argc, fuse_nfs_argv, &nfs_oper, NULL);
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finished:
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if (nfs != NULL) {
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nfs_destroy_context(nfs);
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}
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free(server);
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free(export);
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free(url);
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free(mnt);
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return ret;
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}
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