Fs.c
/*
FUSE: Filesystem in Userspace Copyright (C) 2001-2006 Miklos Szeredi <miklos@szeredi.hu>
This program can be distributed under the terms of the GNU GPL. See the file COPYING.
gcc -Wall `pkg-config fuse --cflags --libs` fusexmp.c -o fusexmp
Template:CTemplate:Filesystems
- /
- define FUSE_USE_VERSION 26
- include <config.h>
- ifdef linux
/* For pread()/pwrite() */
- define _XOPEN_SOURCE 500
- endif
- include <fuse.h>
- include <stdio.h>
- include <string.h>
- include <unistd.h>
- include <fcntl.h>
- include <dirent.h>
- include <errno.h>
- include <sys/time.h>
- ifdef HAVE_SETXATTR
- include <sys/xattr.h>
- endif
static int xmp_getattr(const char *path, struct stat *stbuf) {
int res;
res = lstat(path, stbuf);
if (res == -1)
return -errno;
return 0;
}
static int xmp_access(const char *path, int mask) {
int res;
res = access(path, mask);
if (res == -1)
return -errno;
return 0;
}
static int xmp_readlink(const char *path, char *buf, size_t size) {
int res;
res = readlink(path, buf, size - 1);
if (res == -1)
return -errno;
buf[res] = '\0'; return 0;
}
static int xmp_readdir(const char *path, void *buf, fuse_fill_dir_t filler,
off_t offset, struct fuse_file_info *fi)
{
DIR *dp; struct dirent *de;
(void) offset; (void) fi;
dp = opendir(path);
if (dp == NULL)
return -errno;
while ((de = readdir(dp)) != NULL) {
struct stat st;
memset(&st, 0, sizeof(st));
st.st_ino = de->d_ino;
st.st_mode = de->d_type << 12;
if (filler(buf, de->d_name, &st, 0))
break;
}
closedir(dp); return 0;
}
static int xmp_mknod(const char *path, mode_t mode, dev_t rdev) {
int res;
/* On Linux this could just be 'mknod(path, mode, rdev)' but this
is more portable */
if (S_ISREG(mode)) {
res = open(path, O_CREAT | O_EXCL | O_WRONLY, mode);
if (res >= 0)
res = close(res);
} else if (S_ISFIFO(mode))
res = mkfifo(path, mode);
else
res = mknod(path, mode, rdev);
if (res == -1)
return -errno;
return 0;
}
static int xmp_mkdir(const char *path, mode_t mode) {
int res;
res = mkdir(path, mode);
if (res == -1)
return -errno;
return 0;
}
static int xmp_unlink(const char *path) {
int res;
res = unlink(path);
if (res == -1)
return -errno;
return 0;
}
static int xmp_rmdir(const char *path) {
int res;
res = rmdir(path);
if (res == -1)
return -errno;
return 0;
}
static int xmp_symlink(const char *from, const char *to) {
int res;
res = symlink(from, to);
if (res == -1)
return -errno;
return 0;
}
static int xmp_rename(const char *from, const char *to) {
int res;
res = rename(from, to);
if (res == -1)
return -errno;
return 0;
}
static int xmp_link(const char *from, const char *to) {
int res;
res = link(from, to);
if (res == -1)
return -errno;
return 0;
}
static int xmp_chmod(const char *path, mode_t mode) {
int res;
res = chmod(path, mode);
if (res == -1)
return -errno;
return 0;
}
static int xmp_chown(const char *path, uid_t uid, gid_t gid) {
int res;
res = lchown(path, uid, gid);
if (res == -1)
return -errno;
return 0;
}
static int xmp_truncate(const char *path, off_t size) {
int res;
res = truncate(path, size);
if (res == -1)
return -errno;
return 0;
}
static int xmp_utimens(const char *path, const struct timespec ts[2]) {
int res; struct timeval tv[2];
tv[0].tv_sec = ts[0].tv_sec; tv[0].tv_usec = ts[0].tv_nsec / 1000; tv[1].tv_sec = ts[1].tv_sec; tv[1].tv_usec = ts[1].tv_nsec / 1000;
res = utimes(path, tv);
if (res == -1)
return -errno;
return 0;
}
static int xmp_open(const char *path, struct fuse_file_info *fi) {
int res;
res = open(path, fi->flags);
if (res == -1)
return -errno;
close(res); return 0;
}
static int xmp_read(const char *path, char *buf, size_t size, off_t offset,
struct fuse_file_info *fi)
{
int fd; int res;
(void) fi;
fd = open(path, O_RDONLY);
if (fd == -1)
return -errno;
res = pread(fd, buf, size, offset);
if (res == -1)
res = -errno;
close(fd); return res;
}
static int xmp_write(const char *path, const char *buf, size_t size,
off_t offset, struct fuse_file_info *fi)
{
int fd; int res;
(void) fi;
fd = open(path, O_WRONLY);
if (fd == -1)
return -errno;
res = pwrite(fd, buf, size, offset);
if (res == -1)
res = -errno;
close(fd); return res;
}
static int xmp_statfs(const char *path, struct statvfs *stbuf) {
int res;
res = statvfs(path, stbuf);
if (res == -1)
return -errno;
return 0;
}
static int xmp_release(const char *path, struct fuse_file_info *fi) {
/* Just a stub. This method is optional and can safely be left
unimplemented */
(void) path; (void) fi; return 0;
}
static int xmp_fsync(const char *path, int isdatasync,
struct fuse_file_info *fi)
{
/* Just a stub. This method is optional and can safely be left
unimplemented */
(void) path; (void) isdatasync; (void) fi; return 0;
}
- ifdef HAVE_SETXATTR
/* xattr operations are optional and can safely be left unimplemented */ static int xmp_setxattr(const char *path, const char *name, const char *value,
size_t size, int flags)
{
int res = lsetxattr(path, name, value, size, flags);
if (res == -1)
return -errno;
return 0;
}
static int xmp_getxattr(const char *path, const char *name, char *value,
size_t size)
{
int res = lgetxattr(path, name, value, size);
if (res == -1)
return -errno;
return res;
}
static int xmp_listxattr(const char *path, char *list, size_t size) {
int res = llistxattr(path, list, size);
if (res == -1)
return -errno;
return res;
}
static int xmp_removexattr(const char *path, const char *name) {
int res = lremovexattr(path, name);
if (res == -1)
return -errno;
return 0;
}
- endif /* HAVE_SETXATTR */
static struct fuse_operations xmp_oper = {
.getattr = xmp_getattr, .access = xmp_access, .readlink = xmp_readlink, .readdir = xmp_readdir, .mknod = xmp_mknod, .mkdir = xmp_mkdir, .symlink = xmp_symlink, .unlink = xmp_unlink, .rmdir = xmp_rmdir, .rename = xmp_rename, .link = xmp_link, .chmod = xmp_chmod, .chown = xmp_chown, .truncate = xmp_truncate, .utimens = xmp_utimens, .open = xmp_open, .read = xmp_read, .write = xmp_write, .statfs = xmp_statfs, .release = xmp_release, .fsync = xmp_fsync,
- ifdef HAVE_SETXATTR
.setxattr = xmp_setxattr, .getxattr = xmp_getxattr, .listxattr = xmp_listxattr, .removexattr= xmp_removexattr,
- endif
};
int main(int argc, char *argv[]) {
umask(0); return fuse_main(argc, argv, &xmp_oper, NULL);
}
