/**
* ntfs_device_block_size_set - set block size of a device
* @dev: open device
* @block_size: block size to set @dev to
*
* On success, return 0.
* On error return -1 with errno set to the error code.
*
* The following error codes are defined:
* EINVAL Input parameter error
* EOPNOTSUPP System does not support BLKBSZSET ioctl
* ENOTTY @dev is a file or a device not supporting BLKBSZSET
*/
int ntfs_device_block_size_set(struct ntfs_device *dev,
int block_size __attribute__((unused)))
{
if (!dev) {
errno = EINVAL;
return -1;
}
#ifdef BLKBSZSET
{
size_t s_block_size = block_size;
if (!dev->d_ops->ioctl(dev, BLKBSZSET, &s_block_size)) {
ntfs_log_debug("Used BLKBSZSET to set block size to "
"%d bytes.\n", block_size);
return 0;
}
/* If not a block device, pretend it was successful. */
if (!NDevBlock(dev))
return 0;
}
#else
/* If not a block device, pretend it was successful. */
if (!NDevBlock(dev))
return 0;
errno = EOPNOTSUPP;
#endif
return -1;
}
/**
* ntfs_device_unix_io_open - Open a device and lock it exclusively
* @dev:
* @flags:
*
* Description...
*
* Returns:
*/
static int ntfs_device_unix_io_open(struct ntfs_device *dev, int flags)
{
struct flock flk;
struct stat sbuf;
int err;
if (NDevOpen(dev)) {
errno = EBUSY;
return -1;
}
if (stat(dev->d_name, &sbuf)) {
ntfs_log_perror("Failed to access '%s'", dev->d_name);
return -1;
}
if (S_ISBLK(sbuf.st_mode))
NDevSetBlock(dev);
dev->d_private = ntfs_malloc(sizeof(int));
if (!dev->d_private)
return -1;
/*
* Open file for exclusive access if mounting r/w.
* Fuseblk takes care about block devices.
*/
if (!NDevBlock(dev) && (flags & O_RDWR) == O_RDWR)
flags |= O_EXCL;
*(int*)dev->d_private = open(dev->d_name, flags);
if (*(int*)dev->d_private == -1) {
err = errno;
goto err_out;
}
if ((flags & O_RDWR) != O_RDWR)
NDevSetReadOnly(dev);
memset(&flk, 0, sizeof(flk));
if (NDevReadOnly(dev))
flk.l_type = F_RDLCK;
else
flk.l_type = F_WRLCK;
flk.l_whence = SEEK_SET;
flk.l_start = flk.l_len = 0LL;
if (fcntl(DEV_FD(dev), F_SETLK, &flk)) {
err = errno;
ntfs_log_perror("Failed to %s lock '%s'", NDevReadOnly(dev) ?
"read" : "write", dev->d_name);
if (close(DEV_FD(dev)))
ntfs_log_perror("Failed to close '%s'", dev->d_name);
goto err_out;
}
NDevSetOpen(dev);
return 0;
err_out:
free(dev->d_private);
dev->d_private = NULL;
errno = err;
return -1;
}
