/* SPDX-License-Identifier: GPL-2.0 */

#ifndef __STATMOUNT_H
#define __STATMOUNT_H

#include <stdint.h>
#include <linux/mount.h>
#include <asm/unistd.h>

#ifndef __NR_statmount
        #if defined __alpha__
                #define __NR_statmount 567
        #elif defined _MIPS_SIM
                #if _MIPS_SIM == _MIPS_SIM_ABI32        /* o32 */
                        #define __NR_statmount 4457
                #endif
                #if _MIPS_SIM == _MIPS_SIM_NABI32       /* n32 */
                        #define __NR_statmount 6457
                #endif
                #if _MIPS_SIM == _MIPS_SIM_ABI64        /* n64 */
                        #define __NR_statmount 5457
                #endif
        #else
                #define __NR_statmount 457
        #endif
#endif

#ifndef __NR_listmount
        #if defined __alpha__
                #define __NR_listmount 568
        #elif defined _MIPS_SIM
                #if _MIPS_SIM == _MIPS_SIM_ABI32        /* o32 */
                        #define __NR_listmount 4458
                #endif
                #if _MIPS_SIM == _MIPS_SIM_NABI32       /* n32 */
                        #define __NR_listmount 6458
                #endif
                #if _MIPS_SIM == _MIPS_SIM_ABI64        /* n64 */
                        #define __NR_listmount 5458
                #endif
        #else
                #define __NR_listmount 458
        #endif
#endif

static inline int statmount(uint64_t mnt_id, uint64_t mnt_ns_id, uint32_t fd,
                            uint64_t mask, struct statmount *buf, size_t bufsize,
                            unsigned int flags)
{
        struct mnt_id_req req = {
                .size = MNT_ID_REQ_SIZE_VER0,
                .param = mask,
        };

        if (flags & STATMOUNT_BY_FD) {
                req.size = MNT_ID_REQ_SIZE_VER1;
                req.mnt_fd = fd;
        } else {
                req.mnt_id = mnt_id;
                if (mnt_ns_id) {
                        req.size = MNT_ID_REQ_SIZE_VER1;
                        req.mnt_ns_id = mnt_ns_id;
                }
        }

        return syscall(__NR_statmount, &req, buf, bufsize, flags);
}

static inline ssize_t listmount(uint64_t mnt_id, uint64_t mnt_ns_id,
                         uint64_t last_mnt_id, uint64_t list[], size_t num,
                         unsigned int flags)
{
        struct mnt_id_req req = {
                .size = MNT_ID_REQ_SIZE_VER0,
                .mnt_id = mnt_id,
                .param = last_mnt_id,
        };

        if (mnt_ns_id) {
                req.size = MNT_ID_REQ_SIZE_VER1;
                req.mnt_ns_id = mnt_ns_id;
        }

        return syscall(__NR_listmount, &req, list, num, flags);
}

#endif /* __STATMOUNT_H */