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nfsd: allow filesystems to opt out of subtree checking

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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 <jeff.layton@primarydata.com>
Signed-off-by: Lance Shelton <lance.shelton@hammerspace.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Jeff Layton 2020-11-30 17:03:15 -05:00 • committed by Chuck Lever
parent daab110e47
commit ba5e8187c5
4 changed files with 20 additions and 1 deletions
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1
include/linux/exportfs.h
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@ -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;
};