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NFSD: Report zero space limit for write delegations 

Replace the -1 (no limit) with a zero (no reserved space).

This prevents certain non-determinant client behavior, such as
silly-renaming a file when the only open reference is a write
delegation. Such a rename can leave unexpected .nfs files in a
directory that is otherwise supposed to be empty.

Note that other server implementations that support write delegation
also set this field to zero.

Suggested-by: Dai Ngo <dai.ngo@oracle.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Chuck Lever 2023-07-19 11:33:09 -04:00
parent fd19ca36fd
commit 50bce06f0e
1 changed files with 6 additions and 3 deletions
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9
fs/nfsd/nfs4xdr.c
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@ -3978,17 +3978,20 @@ nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr,
nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
if (nfserr)
return nfserr;
p = xdr_reserve_space(xdr, 32);
p = xdr_reserve_space(xdr, XDR_UNIT * 8);
if (!p)
return nfserr_resource;
*p++ = cpu_to_be32(open->op_recall);
/*
* Always flush on close
*
* TODO: space_limit's in delegations
*/
*p++ = cpu_to_be32(NFS4_LIMIT_SIZE);
*p++ = cpu_to_be32(~(u32)0);
*p++ = cpu_to_be32(~(u32)0);
*p++ = xdr_zero;
*p++ = xdr_zero;
/*
* TODO: ACE's in delegations