// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (c) 2000,2005 Silicon Graphics, Inc.
 * All Rights Reserved.
 */
#include "xfs_platform.h"
#include "xfs_fs.h"
#include "xfs_shared.h"
#include "xfs_format.h"
#include "xfs_da_format.h"
#include "xfs_log_format.h"
#include "xfs_trans_resv.h"
#include "xfs_mount.h"
#include "xfs_da_btree.h"
#include "xfs_bmap_btree.h"
#include "xfs_trans_space.h"

/* Calculate the disk space required to add a parent pointer. */
unsigned int
xfs_parent_calc_space_res(
        struct xfs_mount        *mp,
        unsigned int            namelen)
{
        /*
         * Parent pointers are always the first attr in an attr tree, and never
         * larger than a block
         */
        return XFS_DAENTER_SPACE_RES(mp, XFS_ATTR_FORK) +
               XFS_NEXTENTADD_SPACE_RES(mp, namelen, XFS_ATTR_FORK);
}

unsigned int
xfs_create_space_res(
        struct xfs_mount        *mp,
        unsigned int            namelen)
{
        unsigned int            ret;

        ret = XFS_IALLOC_SPACE_RES(mp) + XFS_DIRENTER_SPACE_RES(mp, namelen);
        if (xfs_has_parent(mp))
                ret += xfs_parent_calc_space_res(mp, namelen);

        return ret;
}

unsigned int
xfs_mkdir_space_res(
        struct xfs_mount        *mp,
        unsigned int            namelen)
{
        return xfs_create_space_res(mp, namelen);
}

unsigned int
xfs_link_space_res(
        struct xfs_mount        *mp,
        unsigned int            namelen)
{
        unsigned int            ret;

        ret = XFS_DIRENTER_SPACE_RES(mp, namelen);
        if (xfs_has_parent(mp))
                ret += xfs_parent_calc_space_res(mp, namelen);

        return ret;
}

unsigned int
xfs_symlink_space_res(
        struct xfs_mount        *mp,
        unsigned int            namelen,
        unsigned int            fsblocks)
{
        unsigned int            ret;

        ret = XFS_IALLOC_SPACE_RES(mp) + XFS_DIRENTER_SPACE_RES(mp, namelen) +
                        fsblocks;

        if (xfs_has_parent(mp))
                ret += xfs_parent_calc_space_res(mp, namelen);

        return ret;
}

unsigned int
xfs_remove_space_res(
        struct xfs_mount        *mp,
        unsigned int            namelen)
{
        unsigned int            ret = XFS_DIRREMOVE_SPACE_RES(mp);

        if (xfs_has_parent(mp))
                ret += xfs_parent_calc_space_res(mp, namelen);

        return ret;
}

unsigned int
xfs_rename_space_res(
        struct xfs_mount        *mp,
        unsigned int            src_namelen,
        bool                    target_exists,
        unsigned int            target_namelen,
        bool                    has_whiteout)
{
        unsigned int            ret;

        ret = XFS_DIRREMOVE_SPACE_RES(mp) +
                        XFS_DIRENTER_SPACE_RES(mp, target_namelen);

        if (xfs_has_parent(mp)) {
                if (has_whiteout)
                        ret += xfs_parent_calc_space_res(mp, src_namelen);
                ret += 2 * xfs_parent_calc_space_res(mp, target_namelen);
        }

        if (target_exists)
                ret += xfs_parent_calc_space_res(mp, target_namelen);

        return ret;
}