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selftests: add a test for the foreign mnt ns extensions

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This tests both statmount and listmount to make sure they work with the
extensions that allow us to specify a mount ns to enter in order to find
the mount entries.

Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Link: https://lore.kernel.org/r/2d1a35bc9ab94b4656c056c420f25e429e7eb0b1.1719243756.git.josef@toxicpanda.com
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Josef Bacik
2024-06-24 11:49:51 -04:00
committed by Christian Brauner
parent e8e43a1fcc
commit d896f71ce1
4 changed files with 424 additions and 41 deletions
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46
tools/testing/selftests/filesystems/statmount/statmount.h Normal file
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@@ -0,0 +1,46 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __STATMOUNT_H
#define __STATMOUNT_H
#include <stdint.h>
#include <linux/mount.h>
#include <asm/unistd.h>
static inline int statmount(uint64_t mnt_id, uint64_t mnt_ns_id, uint64_t mask,
struct statmount *buf, size_t bufsize,
unsigned int flags)
{
struct mnt_id_req req = {
.size = MNT_ID_REQ_SIZE_VER0,
.mnt_id = mnt_id,
.param = mask,
};
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 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 */