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/* Copyright (C) 2012 Philip Langdale
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Library General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#define FUSE_USE_VERSION 26
#include <dirent.h>
#include <errno.h>
#include <libgen.h>
#include <limits.h>
#include <stddef.h>
#include <stdio.h>
#include <string.h>
#include <sys/statvfs.h>
#include <sys/xattr.h>
#include <unistd.h>
#include <config.h>
#include <fuse/fuse.h>
unsigned char get_byte(int id);
struct options {
char *mdd;
} options;
/** macro to define options */
#define PIFS_OPT_KEY(t, p, v) { t, offsetof(struct options, p), v }
static struct fuse_opt pifs_opts[] =
{
PIFS_OPT_KEY("mdd=%s", mdd, 0),
};
#define FULL_PATH(path) \
char full_path[PATH_MAX]; \
snprintf(full_path, PATH_MAX, "%s%s", options.mdd, path); \
printf("full_path: %s\n", full_path);
static int pifs_getattr(const char *path, struct stat *buf)
{
FULL_PATH(path);
int ret = lstat(full_path, buf);
buf->st_size /= 2;
return ret == -1 ? -errno : ret;
}
static int pifs_readlink(const char *path, char *buf, size_t bufsiz)
{
FULL_PATH(path);
int ret = readlink(full_path, buf, bufsiz - 1);
if (ret == -1) {
return -errno;
}
buf[ret] = '\0';
return 0;
}
static int pifs_mknod(const char *path, mode_t mode, dev_t dev)
{
FULL_PATH(path);
int ret = mknod(full_path, mode, dev);
return ret == -1 ? -errno : ret;
}
static int pifs_mkdir(const char *path, mode_t mode)
{
FULL_PATH(path);
int ret = mkdir(full_path, mode | S_IFDIR);
return ret == -1 ? -errno : ret;
}
static int pifs_unlink(const char *path)
{
FULL_PATH(path);
int ret = unlink(full_path);
return ret == -1 ? -errno : ret;
}
static int pifs_rmdir(const char *path)
{
FULL_PATH(path);
int ret = rmdir(full_path);
return ret == -1 ? -errno : ret;
}
static int pifs_symlink(const char *oldpath, const char *newpath)
{
FULL_PATH(newpath);
int ret = symlink(oldpath, full_path);
return ret == -1 ? -errno : ret;
}
static int pifs_rename(const char *oldpath, const char *newpath)
{
FULL_PATH(newpath);
int ret = rename(oldpath, full_path);
return ret == -1 ? -errno : ret;
}
static int pifs_link(const char *oldpath, const char *newpath)
{
FULL_PATH(newpath);
int ret = link(oldpath, full_path);
return ret == -1 ? -errno : ret;
}
static int pifs_chmod(const char *path, mode_t mode)
{
FULL_PATH(path);
int ret = chmod(full_path, mode);
return ret == -1 ? -errno : ret;
}
static int pifs_chown(const char *path, uid_t owner, gid_t group)
{
FULL_PATH(path);
int ret = chown(full_path, owner, group);
return ret == -1 ? -errno : ret;
}
static int pifs_truncate(const char *path, off_t length)
{
FULL_PATH(path);
int ret = truncate(full_path, length * 2);
return ret == -1 ? -errno : ret;
}
static int pifs_utime(const char *path, struct utimbuf *times)
{
FULL_PATH(path);
int ret = utime(full_path, times);
return ret == -1 ? -errno : ret;
}
static int pifs_open(const char *path, struct fuse_file_info *info)
{
FULL_PATH(path);
int ret = open(full_path, info->flags);
info->fh = ret;
return ret == -1 ? -errno : 0;
}
static int pifs_read(const char *path, char *buf, size_t count, off_t offset,
struct fuse_file_info *info)
{
int ret = lseek(info->fh, offset * 2, SEEK_SET);
if (ret == -1) {
return -errno;
}
for (size_t i = 0; i < count; i++) {
short index;
ret = read(info->fh, &index, sizeof index);
if (ret == -1) {
return -errno;
} else if (ret == 0) {
return i;
}
*buf = (char) get_byte(index);
buf++;
}
return count;
}
static int pifs_write(const char *path, const char *buf, size_t count,
off_t offset, struct fuse_file_info *info)
{
int ret = lseek(info->fh, offset * 2, SEEK_SET);
if (ret == -1) {
return -errno;
}
for (size_t i = 0; i < count; i++) {
short index;
for (index = 0; index < SHRT_MAX; index++) {
if (get_byte(index) == *buf) {
break;
}
}
ret = write(info->fh, &index, sizeof index);
if (ret == -1) {
return -errno;
}
buf++;
}
return count;
}
static int pifs_statfs(const char *path, struct statvfs *buf)
{
FULL_PATH(path);
int ret = statvfs(full_path, buf);
return ret == -1 ? -errno : ret;
}
static int pifs_release(const char *path, struct fuse_file_info *info)
{
int ret = close(info->fh);
return ret == -1 ? -errno : ret;
}
static int pifs_fsync(const char *path, int datasync,
struct fuse_file_info *info)
{
int ret = datasync ? fdatasync(info->fh) : fsync(info->fh);
return ret == -1 ? -errno : ret;
}
static int pifs_setxattr(const char *path, const char *name, const char *value,
size_t size, int flags)
{
FULL_PATH(path);
int ret = setxattr(full_path, name, value, size, flags);
return ret == -1 ? -errno : ret;
}
static int pifs_getxattr(const char *path, const char *name, char *value,
size_t size)
{
FULL_PATH(path);
int ret = getxattr(full_path, name, value, size);
return ret == -1 ? -errno : ret;
}
static int pifs_listxattr(const char *path, char *list, size_t size)
{
FULL_PATH(path);
int ret = listxattr(full_path, list, size);
return ret == -1 ? -errno : ret;
}
static int pifs_removexattr(const char *path, const char *name)
{
FULL_PATH(path);
int ret = removexattr(full_path, name);
return ret == -1 ? -errno : ret;
}
static int pifs_opendir(const char *path, struct fuse_file_info *info)
{
FULL_PATH(path);
DIR *dir = opendir(full_path);
info->fh = (uint64_t) dir;
return !dir ? -errno : 0;
}
static int pifs_readdir(const char *path, void *buf, fuse_fill_dir_t filler,
off_t offset, struct fuse_file_info *info)
{
DIR *dir = (DIR *) info->fh;
if (offset) {
seekdir(dir, offset);
}
int ret;
do {
errno = 0;
struct dirent *de = readdir(dir);
if (!de) {
if (errno) {
return -errno;
} else {
break;
}
}
ret = filler(buf, de->d_name, NULL, de->d_off);
} while (ret == 0);
return 0;
}
static int pifs_releasedir(const char *path, struct fuse_file_info *info)
{
int ret = closedir((DIR *)info->fh);
return ret == -1 ? -errno : ret;
}
static int pifs_fsyncdir(const char *path, int datasync,
struct fuse_file_info *info)
{
int fd = dirfd((DIR *)info->fh);
if (fd == -1) {
return -errno;
}
int ret = datasync ? fdatasync(fd) : fsync(fd);
return ret == -1 ? -errno : ret;
}
static int pifs_access(const char *path, int mode)
{
FULL_PATH(path);
int ret = access(full_path, mode);
return ret == -1 ? -errno : ret;
}
static int pifs_create(const char *path, mode_t mode,
struct fuse_file_info *info)
{
FULL_PATH(path);
int ret = creat(full_path, mode);
info->fh = ret;
return ret == -1 ? -errno : 0;
}
static int pifs_ftruncate(const char *path, off_t length,
struct fuse_file_info *info)
{
int ret = ftruncate(info->fh, length * 2);
return ret == -1 ? -errno : ret;
}
static int pifs_fgetattr(const char *path, struct stat *buf,
struct fuse_file_info *info)
{
int ret = fstat(info->fh, buf);
return ret == -1 ? -errno : ret;
}
static int pifs_lock(const char *path, struct fuse_file_info *info, int cmd,
struct flock *lock)
{
int ret = fcntl(info->fh, cmd, lock);
return ret == -1 ? -errno : ret;
}
static int pifs_utimens(const char *path, const struct timespec times[2])
{
DIR *dir = opendir(options.mdd);
if (!dir) {
return -errno;
}
int ret = utimensat(dirfd(dir), basename((char *) path), times, 0);
closedir(dir);
return ret == -1 ? -errno : ret;
}
static struct fuse_operations pifs_ops = {
.getattr = pifs_getattr,
.readlink = pifs_readlink,
.mknod = pifs_mknod,
.mkdir = pifs_mkdir,
.rmdir = pifs_rmdir,
.unlink = pifs_unlink,
.symlink = pifs_symlink,
.rename = pifs_rename,
.link = pifs_link,
.chmod = pifs_chmod,
.chown = pifs_chown,
.truncate = pifs_truncate,
.utime = pifs_utime,
.open = pifs_open,
.read = pifs_read,
.write = pifs_write,
.statfs = pifs_statfs,
.release = pifs_release,
.fsync = pifs_fsync,
.setxattr = pifs_setxattr,
.getxattr = pifs_getxattr,
.listxattr = pifs_listxattr,
.removexattr = pifs_removexattr,
.opendir = pifs_opendir,
.readdir = pifs_readdir,
.releasedir = pifs_releasedir,
.fsyncdir = pifs_fsyncdir,
.access = pifs_access,
.create = pifs_create,
.ftruncate = pifs_ftruncate,
.fgetattr = pifs_fgetattr,
.lock = pifs_lock,
.utimens = pifs_utimens,
.flag_nullpath_ok = 1,
};
int main (int argc, char *argv[])
{
int ret;
struct fuse_args args = FUSE_ARGS_INIT(argc, argv);
memset(&options, 0, sizeof(struct options));
if (fuse_opt_parse(&args, &options, pifs_opts, NULL) == -1) {
return -1;
}
if (!options.mdd) {
fprintf(stderr,
"%s: Metadata directory must be specified with -o mdd=<directory>\n",
argv[0]);
return -1;
}
if (access(options.mdd, R_OK | W_OK | X_OK) == -1) {
fprintf(stderr, "%s: Cannot access metadata directory '%s': %s\n",
argv[0], options.mdd, strerror(errno));
return -1;
}
ret = fuse_main(args.argc, args.argv, &pifs_ops, NULL);
fuse_opt_free_args(&args);
return ret;
}
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