Function dfs_mnt_unref

components/dfs/dfs_v2/src/dfs_mnt.c:338–375

* @brief Decrease the reference count of a dfs_mnt structure instance and free it if necessary. * * This function decrements the reference count of the specified dfs_mnt structure. * If the reference count reaches zero after the decrement, it will perform the unmount operation, * trigger the unmount hook, free the allocated path memory, and finally free the dfs_mnt structure itself. * * @par

 * @return returns RT_EOK to indicate success.
 */
int dfs_mnt_unref(struct dfs_mnt *mnt)
{
    rt_err_t ret = RT_EOK;
    rt_base_t ref_count;

    if (mnt)
    {
        ref_count = rt_atomic_sub(&(mnt->ref_count), 1) - 1;

        if (ref_count == 0)
        {
            dfs_lock();

            if (mnt->flags & MNT_IS_UMOUNT)
            {
                mnt->fs_ops->umount(mnt);

                RT_OBJECT_HOOKLIST_CALL(dfs_mnt_umnt, (mnt));
            }

            /* free full path */
            rt_free(mnt->fullpath);
            mnt->fullpath = RT_NULL;

            /* destroy self and the ref_count should be 0 */
            DLOG(msg, "mnt", "mnt", DLOG_MSG, "free mnt(%s)", mnt->fs_ops->name);
            rt_free(mnt);

            dfs_unlock();
        }
        else
        {
            DLOG(note, "mnt", "mnt(%s),ref_count=%d", mnt->fs_ops->name, rt_atomic_load(&(mnt->ref_count)));
        }
    }

    return ret;
}

/**
 * @brief Set specific flags for a dfs_mnt structure instance.