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nfsd: add support for upcall version 2

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Version 2 upcalls will allow the nfsd to include a hash of the kerberos
principal string in the Cld_Create upcall.  If a principal is present in
the svc_cred, then the hash will be included in the Cld_Create upcall.
We attempt to use the svc_cred.cr_raw_principal (which is returned by
gssproxy) first, and then fall back to using the svc_cred.cr_principal
(which is returned by both gssproxy and rpc.svcgssd).  Upon a subsequent
restart, the hash will be returned in the Cld_Gracestart downcall and
stored in the reclaim_str_hashtbl so it can be used when handling
reclaim opens.

Signed-off-by: Scott Mayhew <smayhew@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Scott Mayhew
2019-09-09 16:10:31 -04:00
committed by J. Bruce Fields
parent 11a60d1592
commit 6ee95d1c89
4 changed files with 245 additions and 17 deletions
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6
fs/nfsd/nfs4state.c
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@@ -6887,7 +6887,8 @@ nfs4_has_reclaimed_state(struct xdr_netobj name, struct nfsd_net *nn)
* will be freed in nfs4_remove_reclaim_record in the normal case).
*/
struct nfs4_client_reclaim *
nfs4_client_to_reclaim(struct xdr_netobj name, struct nfsd_net *nn)
nfs4_client_to_reclaim(struct xdr_netobj name, struct xdr_netobj princhash,
struct nfsd_net *nn)
{
unsigned int strhashval;
struct nfs4_client_reclaim *crp;
@@ -6900,6 +6901,8 @@ nfs4_client_to_reclaim(struct xdr_netobj name, struct nfsd_net *nn)
list_add(&crp->cr_strhash, &nn->reclaim_str_hashtbl[strhashval]);
crp->cr_name.data = name.data;
crp->cr_name.len = name.len;
crp->cr_princhash.data = princhash.data;
crp->cr_princhash.len = princhash.len;
crp->cr_clp = NULL;
nn->reclaim_str_hashtbl_size++;
}
@@ -6911,6 +6914,7 @@ nfs4_remove_reclaim_record(struct nfs4_client_reclaim *crp, struct nfsd_net *nn)
{
list_del(&crp->cr_strhash);
kfree(crp->cr_name.data);
kfree(crp->cr_princhash.data);
kfree(crp);
nn->reclaim_str_hashtbl_size--;
}