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This commit is contained in:
Nicholas Andrew 2026-05-04 04:02:46 -04:00
commit 14bf10f3d1
2 changed files with 30 additions and 0 deletions
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27
fs/namespace.c
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@ -42,6 +42,33 @@ static unsigned int m_hash_shift __read_mostly;
static unsigned int mp_hash_mask __read_mostly;
static unsigned int mp_hash_shift __read_mostly;
# UMOUNT Backport
static int can_umount(const struct path *path, int flags)
{
struct mount *mnt = real_mount(path->mnt);
if (!may_mount())
return -EPERM;
if (!path_mounted(path))
return -EINVAL;
if (!check_mnt(mnt))
return -EINVAL;
if (mnt->mnt.mnt_flags & MNT_LOCKED)
return -EINVAL;
if (flags & MNT_FORCE && !capable(CAP_SYS_ADMIN))
return -EPERM;
return 0;
}
int path_umount(struct path *path, int flags)
{
struct mount *mnt = real_mount(path->mnt);
int ret;
ret = can_umount(path, flags);
if (!ret)
ret = do_umount(mnt, flags);
return ret;
}
static __initdata unsigned long mhash_entries;
static int __init set_mhash_entries(char *str)
{

3
include/linux/fs.h
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@ -46,6 +46,9 @@
#include <uapi/linux/fs.h>
#include <linux/android_vendor.h>
// In fs/namespace.c
EXPORT_SYMBOL(path_umount);
struct backing_dev_info;
struct bdi_writeback;
struct bio;