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Kernelsu: add path_umount implementation

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OnlyTomInSecond 2024-03-19 19:55:41 +02:00 committed by Lup Gabriel
parent 6af21647ad
commit 51661d3e23
1 changed files with 32 additions and 0 deletions
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32
fs/namespace.c
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@ -1711,6 +1711,38 @@ static inline bool may_mandlock(void)
}
#endif
static int can_umount(const struct path *path, int flags)
{
struct mount *mnt = real_mount(path->mnt);
if (!may_mount())
return -EPERM;
if (path->dentry != path->mnt->mnt_root)
return -EINVAL;
if (!check_mnt(mnt))
return -EINVAL;
if (mnt->mnt.mnt_flags & MNT_LOCKED) /* Check optimistically */
return -EINVAL;
if (flags & MNT_FORCE && !capable(CAP_SYS_ADMIN))
return -EPERM;
return 0;
}
// caller is responsible for flags being sane
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);
/* we mustn't call path_put() as that would clear mnt_expiry_mark */
dput(path->dentry);
mntput_no_expire(mnt);
return ret;
}
/*
* Now umount can handle mount points as well as block devices.
* This is important for filesystems which use unnamed block devices.