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Sourcecode: fuse version File versions

fusexmp.c

/*
  FUSE: Filesystem in Userspace
  Copyright (C) 2001-2007  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
*/

#define FUSE_USE_VERSION 26

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#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);
}

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