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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __STATMOUNT_H
#define __STATMOUNT_H
#include <errno.h>
#include <stdint.h>
#include <stdlib.h>
#include <linux/mount.h>
#include <asm/unistd.h>
#define STATMOUNT_BUFSIZE (1 << 15)
#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);
}
static inline struct statmount *statmount_alloc(uint64_t mnt_id, uint64_t mnt_ns_id,
uint64_t mask, unsigned int flags)
{
struct statmount *buf;
size_t bufsize = STATMOUNT_BUFSIZE;
int ret;
for (;;) {
buf = malloc(bufsize);
if (!buf)
return NULL;
ret = statmount(mnt_id, mnt_ns_id, 0, mask, buf, bufsize, flags);
if (ret == 0)
return buf;
free(buf);
if (errno != EOVERFLOW)
return NULL;
bufsize <<= 1;
}
}
static inline struct statmount *statmount_alloc_by_fd(int fd, uint64_t mask)
{
struct statmount *buf;
size_t bufsize = STATMOUNT_BUFSIZE;
int ret;
for (;;) {
buf = malloc(bufsize);
if (!buf)
return NULL;
ret = statmount(0, 0, fd, mask, buf, bufsize, STATMOUNT_BY_FD);
if (ret == 0)
return buf;
free(buf);
if (errno != EOVERFLOW)
return NULL;
bufsize <<= 1;
}
}
#endif /* __STATMOUNT_H */
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