Function dfs_mnt_insert

components/dfs/dfs_v2/src/dfs_mnt.c:85–136

* @brief Insert a child mount point into the mount tree. * * This function inserts a child mount point into the specified parent mount point's child list. * If the parent mount point is not provided, it will try to find the appropriate mount point based on the child's path. * If the child mount point is the root, it will update the global root mount point accordingly. * * @param[in,out] mnt

 * @return Always returns 0 to indicate success.
 */
int dfs_mnt_insert(struct dfs_mnt* mnt, struct dfs_mnt* child)
{
    if (child)
    {
        if (mnt == RT_NULL)
        {
            /* insert into root */
            mnt = dfs_mnt_lookup(child->fullpath);
            if (mnt == RT_NULL || (strcmp(child->fullpath, "/") == 0))
            {
                /* it's root mnt */
                mnt = child;
                mnt->flags |= MNT_IS_LOCKED;

                /* ref to gobal root */
                if (_root_mnt)
                {
                    child = _root_mnt;
                    rt_atomic_sub(&(_root_mnt->parent->ref_count), 1);
                    rt_atomic_sub(&(_root_mnt->ref_count), 1);
                    _root_mnt->flags &= ~MNT_IS_LOCKED;

                    _root_mnt = dfs_mnt_ref(mnt);
                    mnt->parent = dfs_mnt_ref(mnt);
                    mnt->flags |= MNT_IS_ADDLIST;

                    mkdir("/dev", 0777);
                }
                else
                {
                    _root_mnt = dfs_mnt_ref(mnt);
                }
            }
        }

        if (mnt)
        {
            child->flags |= MNT_IS_ADDLIST;
            if (child != mnt)
            {
                /* not the root, insert into the child list */
                rt_list_insert_before(&mnt->child, &child->sibling);
                /* child ref self */
                dfs_mnt_ref(child);
            }
            /* parent ref parent */
            child->parent = dfs_mnt_ref(mnt);
        }
    }

    return 0;
}

/**
 * @brief Remove a mount point from the mount tree.