Evolution-X-Devices/kernel_xiaomi_sm8150
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BACKPORT: fs: path_umount for KernelSu

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Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>
This commit is contained in:
chiteroman
2024-03-08 01:56:05 +01:00
committed by Pranav Vashi
parent 6e4f18d8ab
commit 04a1e6280b
2 changed files with 47 additions and 0 deletions
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1
fs/internal.h
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@@ -68,6 +68,7 @@ extern int finish_automount(struct vfsmount *, struct path *);
extern int sb_prepare_remount_readonly(struct super_block *);
extern void __init mnt_init(void);
int path_umount(struct path *path, int flags);
extern int __mnt_want_write(struct vfsmount *);
extern int __mnt_want_write_file(struct file *);

46
fs/namespace.c
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@@ -1739,6 +1739,52 @@ static inline bool may_mandlock(void)
}
#endif
/**
* path_mounted - check whether path is mounted
* @path: path to check
*
* Determine whether @path refers to the root of a mount.
*
* Return: true if @path is the root of a mount, false if not.
*/
static inline bool path_mounted(const struct path *path)
{
return path->mnt->mnt_root == path->dentry;
}
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) /* 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.