/*
FUSE: Filesystem in Userspace
Copyright (C) 2001-2007 Miklos Szeredi <miklos@szeredi.hu>
Copyright (C) 2011 Sebastian Pipping <sebastian@pipping.org>
This program can be distributed under the terms of the GNU GPL.
See the file COPYING.
*/
#define FUSE_USE_VERSION 30
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#ifdef linux
/* For pread()/pwrite()/utimensat() */
#define _XOPEN_SOURCE 700
#endif
#include <fuse.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/stat.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;
}
#ifdef HAVE_UTIMENSAT
static int xmp_utimens(const char *path, const struct timespec ts[2])
{
int res;
/* don't use utime/utimes since they follow symlinks */
res = utimensat(0, path, ts, AT_SYMLINK_NOFOLLOW);
if (res == -1)
return -errno;
return 0;
}
#endif
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_POSIX_FALLOCATE
static int xmp_fallocate(const char *path, int mode,
off_t offset, off_t length, struct fuse_file_info *fi)
{
int fd;
int res;
(void) fi;
if (mode)
return -EOPNOTSUPP;
fd = open(path, O_WRONLY);
if (fd == -1)
return -errno;
res = -posix_fallocate(fd, offset, length);
close(fd);
return res;
}
#endif
#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,
#ifdef HAVE_UTIMENSAT
.utimens = xmp_utimens,
#endif
.open = xmp_open,
.read = xmp_read,
.write = xmp_write,
.statfs = xmp_statfs,
.release = xmp_release,
.fsync = xmp_fsync,
#ifdef HAVE_POSIX_FALLOCATE
.fallocate = xmp_fallocate,
#endif
#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);
}
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