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nfsd: decode implementation id

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Decode the implementation ID and display in nfsd/clients/#/info.  It may
be help identify the client.  It won't be used otherwise.

(When this went into the protocol, I thought the implementation ID would
be a slippery slope towards implementation-specific workarounds as with
the http user-agent.  But I guess I was wrong, the risk seems pretty low
now.)

Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
J. Bruce Fields
2019-06-05 12:42:05 -04:00
parent 6f4859b8a7
commit 791234448d
4 changed files with 46 additions and 12 deletions
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30
fs/nfsd/nfs4state.c
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@@ -1899,6 +1899,8 @@ static void __free_client(struct kref *k)
free_svc_cred(&clp->cl_cred);
kfree(clp->cl_ownerstr_hashtbl);
kfree(clp->cl_name.data);
kfree(clp->cl_nii_domain.data);
kfree(clp->cl_nii_name.data);
idr_destroy(&clp->cl_stateids);
kmem_cache_free(client_slab, clp);
}
@@ -2261,6 +2263,15 @@ static int client_info_show(struct seq_file *m, void *v)
seq_printf(m, "name: ");
seq_quote_mem(m, clp->cl_name.data, clp->cl_name.len);
seq_printf(m, "\nminor version: %d\n", clp->cl_minorversion);
if (clp->cl_nii_domain.data) {
seq_printf(m, "Implementation domain: ");
seq_quote_mem(m, clp->cl_nii_domain.data,
clp->cl_nii_domain.len);
seq_printf(m, "\nImplementation name: ");
seq_quote_mem(m, clp->cl_nii_name.data, clp->cl_nii_name.len);
seq_printf(m, "\nImplementation time: [%ld, %ld]\n",
clp->cl_nii_time.tv_sec, clp->cl_nii_time.tv_nsec);
}
drop_client(clp);
return 0;
@@ -2901,6 +2912,22 @@ static bool client_has_state(struct nfs4_client *clp)
|| !list_empty(&clp->async_copies);
}
static __be32 copy_impl_id(struct nfs4_client *clp,
struct nfsd4_exchange_id *exid)
{
if (!exid->nii_domain.data)
return 0;
xdr_netobj_dup(&clp->cl_nii_domain, &exid->nii_domain, GFP_KERNEL);
if (!clp->cl_nii_domain.data)
return nfserr_jukebox;
xdr_netobj_dup(&clp->cl_nii_name, &exid->nii_name, GFP_KERNEL);
if (!clp->cl_nii_name.data)
return nfserr_jukebox;
clp->cl_nii_time.tv_sec = exid->nii_time.tv_sec;
clp->cl_nii_time.tv_nsec = exid->nii_time.tv_nsec;
return 0;
}
__be32
nfsd4_exchange_id(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
@@ -2927,6 +2954,9 @@ nfsd4_exchange_id(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
new = create_client(exid->clname, rqstp, &verf);
if (new == NULL)
return nfserr_jukebox;
status = copy_impl_id(new, exid);
if (status)
goto out_nolock;
switch (exid->spa_how) {
case SP4_MACH_CRED: