Function dfs_file_ftruncate

components/dfs/dfs_v2/src/dfs_file.c:2211–2245

* @brief Truncate or extend a file to the specified length * * This function changes the size of the file referenced by the file descriptor. * If the new size is smaller than current size, the file is truncated. * If larger, the file is extended and the extended area is filled with zeros. * * @param[in] file Pointer to the file structure to truncate * @param[in] length New length of the fil

 *       before truncation to ensure data consistency
 */
int dfs_file_ftruncate(struct dfs_file *file, off_t length)
{
    int ret = 0;

    if (file)
    {
        if (file->fops->truncate)
        {
            if (dfs_is_mounted(file->vnode->mnt) == 0)
            {
#ifdef RT_USING_PAGECACHE
                if (file->vnode->aspace)
                {
                    dfs_aspace_clean(file->vnode->aspace);
                }
#endif
                ret = file->fops->truncate(file, length);
            }
            else
            {
                ret = -EINVAL;
            }
        }
        else
        {
            ret = -ENOSYS;
        }
    }
    else
    {
        ret = -EBADF;
    }

    return ret;
}

/**
 * @brief Flush file buffers to storage device