Function dfs_mount

components/dfs/dfs_v2/src/dfs_fs.c:221–420

* @brief Mount a filesystem at the specified path * * This function mounts a filesystem of the specified type at the given path with optional device. * It handles both root filesystem mounting and regular filesystem mounting scenarios. * * @param[in] device_name The name of the device to mount (optional) * @param[in] path The path of the mount point * @param[in] filesystemtype The type of t

 * @note Automatic reference counting management for mount points
 */
int dfs_mount(const char *device_name,
              const char *path,
              const char *filesystemtype,
              unsigned long rwflag,
              const void *data)
{
    int ret = RT_EOK;
    char *fullpath = RT_NULL;
    rt_device_t dev_id = RT_NULL;
    struct dfs_mnt *mnt_parent = RT_NULL, *mnt_child = RT_NULL;
    struct dfs_dentry *mntpoint_dentry = RT_NULL;
    struct dfs_filesystem_type *type = *_find_filesystem(filesystemtype);

    /* normalize the mount path */
    if (type)
    {
        fullpath = dfs_normalize_path(RT_NULL, path);
        if (!fullpath)
        {
            rt_set_errno(EPERM);
            ret = -1;
        }
    }
    else
    {
        rt_set_errno(ENODEV);
        ret = -1;
    }

    /* Main mounting procedure */
    if (fullpath)
    {
        DLOG(note, "mnt", "mount %s(%s) on path: %s", device_name, filesystemtype, fullpath);

        /* open specific device */
        if (device_name) dev_id = rt_device_find(device_name);

        /* Check device requirements */
        if (!(type->fs_ops->flags & FS_NEED_DEVICE) ||
            ((type->fs_ops->flags & FS_NEED_DEVICE) && dev_id))
        {
            DLOG(msg, "dfs", "mnt", DLOG_MSG, "mnt_parent = dfs_mnt_lookup(%s)", fullpath);
            mnt_parent = dfs_mnt_lookup(fullpath); /* Find parent mount point */

            /* Handle root filesystem mounting */
            if ((!mnt_parent && (strcmp(fullpath, "/") == 0 || strcmp(fullpath, "/dev") == 0))
                || (mnt_parent && strcmp(fullpath, "/") == 0 && strcmp(mnt_parent->fullpath, fullpath) != 0))
            {
                LOG_D("no mnt found @ mount point %s, should be root.", fullpath);
                DLOG(msg, "mnt", "dfs", DLOG_MSG_RET, "no mnt");

                /* it's the root file system */
                /* the mount point dentry is the same as root dentry. */
                /* Create root filesystem mount point */
                DLOG(msg, "dfs", "mnt", DLOG_MSG, "mnt_parent = dfs_mnt_create(path)");
                mnt_parent = dfs_mnt_create(fullpath); /* mnt->ref_count should be 1. */
                if (mnt_parent)
                {