text: /*
   * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
   * Licensed under the GPL
   */
  
  #include <stdio.h>
  #include <stddef.h>
  #include <unistd.h>
  #include <dirent.h>
  #include <errno.h>
  #include <fcntl.h>
  #include <string.h>
  #include <sys/stat.h>
  #include <sys/time.h>
  #include <sys/types.h>
  #include <sys/vfs.h>
  #include "hostfs.h"
  #include "os.h"
  #include "user.h"
  #include <utime.h>
  
  int stat_file(const char *path, unsigned long long *inode_out, int *mode_out,
  	      int *nlink_out, int *uid_out, int *gid_out,
  	      unsigned long long *size_out, struct timespec *atime_out,
  	      struct timespec *mtime_out, struct timespec *ctime_out,
  	      int *blksize_out, unsigned long long *blocks_out, int fd)
  {
  	struct stat64 buf;
  
  	if (fd >= 0) {
  		if (fstat64(fd, &buf) < 0)
  			return -errno;
  	} else if (lstat64(path, &buf) < 0) {
  		return -errno;
  	}
  
  	if (inode_out != NULL)
  		*inode_out = buf.st_ino;
  	if (mode_out != NULL)
  		*mode_out = buf.st_mode;
  	if (nlink_out != NULL)
  		*nlink_out = buf.st_nlink;
  	if (uid_out != NULL)
  		*uid_out = buf.st_uid;
  	if (gid_out != NULL)
  		*gid_out = buf.st_gid;
  	if (size_out != NULL)
  		*size_out = buf.st_size;
  	if (atime_out != NULL) {
  		atime_out->tv_sec = buf.st_atime;
  		atime_out->tv_nsec = 0;
  	}
  	if (mtime_out != NULL) {
  		mtime_out->tv_sec = buf.st_mtime;
  		mtime_out->tv_nsec = 0;
  	}
  	if (ctime_out != NULL) {
  		ctime_out->tv_sec = buf.st_ctime;
  		ctime_out->tv_nsec = 0;
  	}
  	if (blksize_out != NULL)
  		*blksize_out = buf.st_blksize;
  	if (blocks_out != NULL)
  		*blocks_out = buf.st_blocks;
  	return 0;
  }
  
  int file_type(const char *path, int *maj, int *min)
  {
   	struct stat64 buf;
  
  	if (lstat64(path, &buf) < 0)
  		return -errno;
  	/*
  	 * We cannot pass rdev as is because glibc and the kernel disagree
  	 * about its definition.
  	 */
  	if (maj != NULL)
  		*maj = major(buf.st_rdev);
  	if (min != NULL)
  		*min = minor(buf.st_rdev);
  
  	if (S_ISDIR(buf.st_mode))
  		return OS_TYPE_DIR;
  	else if (S_ISLNK(buf.st_mode))
  		return OS_TYPE_SYMLINK;
  	else if (S_ISCHR(buf.st_mode))
  		return OS_TYPE_CHARDEV;
  	else if (S_ISBLK(buf.st_mode))
  		return OS_TYPE_BLOCKDEV;
  	else if (S_ISFIFO(buf.st_mode))
  		return OS_TYPE_FIFO;
  	else if (S_ISSOCK(buf.st_mode))
  		return OS_TYPE_SOCK;
  	else return OS_TYPE_FILE;
  }
  
  int access_file(char *path, int r, int w, int x)
  {
  	int mode = 0;
  
  	if (r)
  		mode = R_OK;
  	if (w)
  		mode |= W_OK;
  	if (x)
  		mode |= X_OK;
  	if (access(path, mode) != 0)
  		return -errno;
  	else return 0;
  }
  
  int open_file(char *path, int r, int w, int append)
  {
  	int mode = 0, fd;
  
  	if (r && !w)
  		mode = O_RDONLY;
  	else if (!r && w)
  		mode = O_WRONLY;
  	else if (r && w)
  		mode = O_RDWR;
  	else panic("Impossible mode in open_file");
  
  	if (append)
  		mode |= O_APPEND;
  	fd = open64(path, mode);
  	if (fd < 0)
  		return -errno;
  	else return fd;
  }
  
  void *open_dir(char *path, int *err_out)
  {
  	DIR *dir;
  
  	dir = opendir(path);
  	*err_out = errno;
  	if (dir == NULL)
  		return NULL;
  	return dir;
  }
  
  char *read_dir(void *stream, unsigned long long *pos,
  	       unsigned long long *ino_out, int *len_out)
  {
  	DIR *dir = stream;
  	struct dirent *ent;
  
  	seekdir(dir, *pos);
  	ent = readdir(dir);
  	if (ent == NULL)
  		return NULL;
  	*len_out = strlen(ent->d_name);
  	*ino_out = ent->d_ino;
  	*pos = telldir(dir);
  	return ent->d_name;
  }
  
  int read_file(int fd, unsigned long long *offset, char *buf, int len)
  {
  	int n;
  
  	n = pread64(fd, buf, len, *offset);
  	if (n < 0)
  		return -errno;
  	*offset += n;
  	return n;
  }
  
  int write_file(int fd, unsigned long long *offset, const char *buf, int len)
  {
  	int n;
  
  	n = pwrite64(fd, buf, len, *offset);
  	if (n < 0)
  		return -errno;
  	*offset += n;
  	return n;
  }
  
  int lseek_file(int fd, long long offset, int whence)
  {
  	int ret;
  
  	ret = lseek64(fd, offset, whence);
  	if (ret < 0)
  		return -errno;
  	return 0;
  }
  
  int fsync_file(int fd, int datasync)
  {
  	int ret;
  	if (datasync)
  		ret = fdatasync(fd);
  	else
  		ret = fsync(fd);
  
  	if (ret < 0)
  		return -errno;
  	return 0;
  }
  
  void close_file(void *stream)
  {
  	close(*((int *) stream));
  }
  
  void close_dir(void *stream)
  {
  	closedir(stream);
  }
  
  int file_create(char *name, int ur, int uw, int ux, int gr,
  		int gw, int gx, int or, int ow, int ox)
  {
  	int mode, fd;
  
  	mode = 0;
  	mode |= ur ? S_IRUSR : 0;
  	mode |= uw ? S_IWUSR : 0;
  	mode |= ux ? S_IXUSR : 0;
  	mode |= gr ? S_IRGRP : 0;
  	mode |= gw ? S_IWGRP : 0;
  	mode |= gx ? S_IXGRP : 0;
  	mode |= or ? S_IROTH : 0;
  	mode |= ow ? S_IWOTH : 0;
  	mode |= ox ? S_IXOTH : 0;
  	fd = open64(name, O_CREAT | O_RDWR, mode);
  	if (fd < 0)
  		return -errno;
  	return fd;
  }
  
  int set_attr(const char *file, struct hostfs_iattr *attrs, int fd)
  {
  	struct timeval times[2];
  	struct timespec atime_ts, mtime_ts;
  	int err, ma;
  
  	if (attrs->ia_valid & HOSTFS_ATTR_MODE) {
  		if (fd >= 0) {
  			if (fchmod(fd, attrs->ia_mode) != 0)
  				return (-errno);
  		} else if (chmod(file, attrs->ia_mode) != 0) {
  			return -errno;
  		}
  	}
  	if (attrs->ia_valid & HOSTFS_ATTR_UID) {
  		if (fd >= 0) {
  			if (fchown(fd, attrs->ia_uid, -1))
  				return -errno;
  		} else if (chown(file, attrs->ia_uid, -1)) {
  			return -errno;
  		}
  	}
  	if (attrs->ia_valid & HOSTFS_ATTR_GID) {
  		if (fd >= 0) {
  			if (fchown(fd, -1, attrs->ia_gid))
  				return -errno;
  		} else if (chown(file, -1, attrs->ia_gid)) {
  			return -errno;
  		}
  	}
  	if (attrs->ia_valid & HOSTFS_ATTR_SIZE) {
  		if (fd >= 0) {
  			if (ftruncate(fd, attrs->ia_size))
  				return -errno;
  		} else if (truncate(file, attrs->ia_size)) {
  			return -errno;
  		}
  	}
  
  	/*
  	 * Update accessed and/or modified time, in two parts: first set
  	 * times according to the changes to perform, and then call futimes()
  	 * or utimes() to apply them.
  	 */
  	ma = (HOSTFS_ATTR_ATIME_SET | HOSTFS_ATTR_MTIME_SET);
  	if (attrs->ia_valid & ma) {
  		err = stat_file(file, NULL, NULL, NULL, NULL, NULL, NULL,
  				&atime_ts, &mtime_ts, NULL, NULL, NULL, fd);
  		if (err != 0)
  			return err;
  
  		times[0].tv_sec = atime_ts.tv_sec;
  		times[0].tv_usec = atime_ts.tv_nsec / 1000;
  		times[1].tv_sec = mtime_ts.tv_sec;
  		times[1].tv_usec = mtime_ts.tv_nsec / 1000;
  
  		if (attrs->ia_valid & HOSTFS_ATTR_ATIME_SET) {
  			times[0].tv_sec = attrs->ia_atime.tv_sec;
  			times[0].tv_usec = attrs->ia_atime.tv_nsec / 1000;
  		}
  		if (attrs->ia_valid & HOSTFS_ATTR_MTIME_SET) {
  			times[1].tv_sec = attrs->ia_mtime.tv_sec;
  			times[1].tv_usec = attrs->ia_mtime.tv_nsec / 1000;
  		}
  
  		if (fd >= 0) {
  			if (futimes(fd, times) != 0)
  				return -errno;
  		} else if (utimes(file, times) != 0) {
  			return -errno;
  		}
  	}
  
  	/* Note: ctime is not handled */
  	if (attrs->ia_valid & (HOSTFS_ATTR_ATIME | HOSTFS_ATTR_MTIME)) {
  		err = stat_file(file, NULL, NULL, NULL, NULL, NULL, NULL,
  				&attrs->ia_atime, &attrs->ia_mtime, NULL,
  				NULL, NULL, fd);
  		if (err != 0)
  			return err;
  	}
  	return 0;
  }
  
  int make_symlink(const char *from, const char *to)
  {
  	int err;
  
  	err = symlink(to, from);
  	if (err)
  		return -errno;
  	return 0;
  }
  
  int unlink_file(const char *file)
  {
  	int err;
  
  	err = unlink(file);
  	if (err)
  		return -errno;
  	return 0;
  }
  
  int do_mkdir(const char *file, int mode)
  {
  	int err;
  
  	err = mkdir(file, mode);
  	if (err)
  		return -errno;
  	return 0;
  }
  
  int do_rmdir(const char *file)
  {
  	int err;
  
  	err = rmdir(file);
  	if (err)
  		return -errno;
  	return 0;
  }
  
  int do_mknod(const char *file, int mode, unsigned int major, unsigned int minor)
  {
  	int err;
  
  	err = mknod(file, mode, makedev(major, minor));
  	if (err)
  		return -errno;
  	return 0;
  }
  
  int link_file(const char *to, const char *from)
  {
  	int err;
  
  	err = link(to, from);
  	if (err)
  		return -errno;
  	return 0;
  }
  
  int hostfs_do_readlink(char *file, char *buf, int size)
  {
  	int n;
  
  	n = readlink(file, buf, size);
  	if (n < 0)
  		return -errno;
  	if (n < size)
  		buf[n] = '\0';
  	return n;
  }
  
  int rename_file(char *from, char *to)
  {
  	int err;
  
  	err = rename(from, to);
  	if (err < 0)
  		return -errno;
  	return 0;
  }
  
  int do_statfs(char *root, long *bsize_out, long long *blocks_out,
  	      long long *bfree_out, long long *bavail_out,
  	      long long *files_out, long long *ffree_out,
  	      void *fsid_out, int fsid_size, long *namelen_out,
  	      long *spare_out)
  {
  	struct statfs64 buf;
  	int err;
  
  	err = statfs64(root, &buf);
  	if (err < 0)
  		return -errno;
  
  	*bsize_out = buf.f_bsize;
  	*blocks_out = buf.f_blocks;
  	*bfree_out = buf.f_bfree;
  	*bavail_out = buf.f_bavail;
  	*files_out = buf.f_files;
  	*ffree_out = buf.f_ffree;
  	memcpy(fsid_out, &buf.f_fsid,
  	       sizeof(buf.f_fsid) > fsid_size ? fsid_size :
  	       sizeof(buf.f_fsid));
  	*namelen_out = buf.f_namelen;
  	spare_out[0] = buf.f_spare[0];
  	spare_out[1] = buf.f_spare[1];
  	spare_out[2] = buf.f_spare[2];
  	spare_out[3] = buf.f_spare[3];
  	spare_out[4] = buf.f_spare[4];
  	return 0;
  }
  