From ba5e8187c55555519ae0b63c0fb681391bc42af9 Mon Sep 17 00:00:00 2001 From: Jeff Layton Date: Mon, 30 Nov 2020 17:03:15 -0500 Subject: nfsd: allow filesystems to opt out of subtree checking When we start allowing NFS to be reexported, then we have some problems when it comes to subtree checking. In principle, we could allow it, but it would mean encoding parent info in the filehandles and there may not be enough space for that in a NFSv3 filehandle. To enforce this at export upcall time, we add a new export_ops flag that declares the filesystem ineligible for subtree checking. Signed-off-by: Jeff Layton Signed-off-by: Lance Shelton Signed-off-by: Trond Myklebust Signed-off-by: Chuck Lever --- include/linux/exportfs.h | 1 + 1 file changed, 1 insertion(+) (limited to 'include/linux/exportfs.h') diff --git a/include/linux/exportfs.h b/include/linux/exportfs.h index e7de0103a32e..2fcbab0f6b61 100644 --- a/include/linux/exportfs.h +++ b/include/linux/exportfs.h @@ -214,6 +214,7 @@ struct export_operations { int (*commit_blocks)(struct inode *inode, struct iomap *iomaps, int nr_iomaps, struct iattr *iattr); #define EXPORT_OP_NOWCC (0x1) /* Don't collect wcc data for NFSv3 replies */ +#define EXPORT_OP_NOSUBTREECHK (0x2) /* Subtree checking is not supported! */ unsigned long flags; }; -- cgit v1.2.3