mainline inclusion
from mainline-5.14-rc1
commit bcba1e7d
category: bugfix
bugzilla: 181657 https://gitee.com/openeuler/kernel/issues/I4DDEL
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=bcba1e7d0d520adba895d9e0800a056f734b0a6a

---------------------------

Separate field in nameidata (nd->state) holding the flags that
should be internal-only - that way we both get some spare bits
in LOOKUP_... and get simpler rules for nd->root lifetime rules,
since we can set the replacement of LOOKUP_ROOT (ND_ROOT_PRESET)
at the same time we set nd->root.
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

Conflicts:
	fs/namei.c
	[ Bugfix 7d01ef75("Make sure nd->path.mnt and nd->path.dentry
	  are always valid pointers") is not applid, the problem to be
	  fixed not exists.
	  Feature 6c6ec2b0("fs: add support for LOOKUP_CACHED") is
	  not applied. ]
Signed-off-by: NZhihao Cheng <chengzhihao1@huawei.com>
Reviewed-by: NZhang Yi <yi.zhang@huawei.com>
Signed-off-by: NChen Jun <chenjun102@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>