Function dfs_file_close

components/dfs/dfs_v2/src/dfs_file.c:840–882

* @brief Close a file and release associated resources * * This function closes a file and performs necessary cleanup operations: * - Flushes page cache if enabled (RT_USING_PAGECACHE) * - Calls filesystem-specific close operation if available * - Decrements reference count and releases resources when count reaches zero * * @param[in,out] file Pointer to the file structure to close * * @r

 *         - Negative error code on failure
 */
int dfs_file_close(struct dfs_file *file)
{
    int ret = -RT_ERROR;

    if (file)
    {
        if (dfs_file_lock() == RT_EOK)
        {
            rt_atomic_t ref_count = rt_atomic_load(&(file->ref_count));

            if (ref_count == 1 && file->fops && file->fops->close)
            {
                DLOG(msg, "dfs_file", file->dentry->mnt->fs_ops->name, DLOG_MSG, "fops->close(file)");
#ifdef RT_USING_PAGECACHE
                if (file->vnode->aspace)
                {
                    dfs_aspace_flush(file->vnode->aspace);
                }
#endif
                ret = file->fops->close(file);

                if (ret == 0) /* close file sucessfully */
                {
                    DLOG(msg, "dfs_file", "dfs_file", DLOG_MSG, "dfs_file_unref(file)");
                    dfs_file_unref(file);
                }
                else
                {
                    LOG_W("close file:%s failed on low level file system", file->dentry->pathname);
                }
            }
            else
            {
                DLOG(msg, "dfs_file", "dfs_file", DLOG_MSG, "dfs_file_unref(file)");
                dfs_file_unref(file);
                ret = 0;
            }
            dfs_file_unlock();
        }
    }

    return ret;
}

/**
 * @brief Read data from a file at specified offset