Function dfs_umount

components/dfs/dfs_v2/src/dfs_fs.c:446–497

* @brief Unmount a filesystem from the specified path * * This function unmounts a filesystem from the given path. It performs the following operations: * 1. Normalizes the target path * 2. Looks up the mount point * 3. Checks if the filesystem can be safely unmounted * 4. Performs cleanup operations if unmounting is successful * * @param[in] specialfile The path of the filesystem to unmou

 *       - Reference count > 1 and MNT_FORCE not specified
 */
int dfs_umount(const char *specialfile, int flags)
{
    int ret = -1;
    char *fullpath = RT_NULL;
    struct dfs_mnt *mnt = RT_NULL;

    fullpath = dfs_normalize_path(NULL, specialfile);
    if (fullpath)
    {
        DLOG(msg, "dfs", "mnt", DLOG_MSG, "mnt = dfs_mnt_lookup(%s)", fullpath);
        mnt = dfs_mnt_lookup(fullpath);
        if (mnt)
        {
            if (strcmp(mnt->fullpath, fullpath) == 0)
            {
                /* is the mount point */
                rt_base_t ref_count = rt_atomic_load(&(mnt->ref_count));

                if (!(mnt->flags & MNT_IS_LOCKED) && rt_list_isempty(&mnt->child) && (ref_count == 1 || (flags & MNT_FORCE)))
                {
#ifdef RT_USING_PAGECACHE
                    dfs_pcache_unmount(mnt);
#endif
                    /* destroy this mount point */
                    DLOG(msg, "dfs", "mnt", DLOG_MSG, "dfs_mnt_destroy(mnt)");
                    ret = dfs_mnt_destroy(mnt);
                }
                else
                {
                    LOG_I("the file system is busy!");
                    ret = -EBUSY;
                }
            }
            else
            {
                LOG_I("the path:%s is not a mountpoint!", fullpath);
                ret = -EINVAL;
            }
        }
        else
        {
            LOG_I("no filesystem found.");
        }
        rt_free(fullpath);
    }
    else
    {
        rt_set_errno(-ENOTDIR);
    }

    return ret;
}

/* for compatibility */
int dfs_unmount(const char *specialfile)