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NFSD: Move copy offload callback arguments into a separate structure 

Refactor so that CB_OFFLOAD arguments can be passed without
allocating a whole struct nfsd4_copy object. On my system (x86_64)
this removes another 96 bytes from struct nfsd4_copy.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Chuck Lever 2022-07-27 14:41:18 -04:00
parent e72f9bc006
commit a11ada99ce
3 changed files with 47 additions and 45 deletions
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37
fs/nfsd/nfs4callback.c
View File

@ -679,7 +679,7 @@ static int nfs4_xdr_dec_cb_notify_lock(struct rpc_rqst *rqstp,
* case NFS4_OK:
* write_response4 coa_resok4;
* default:
* length4 coa_bytes_copied;
* length4 coa_bytes_copied;
* };
* struct CB_OFFLOAD4args {
* nfs_fh4 coa_fh;
@ -688,21 +688,22 @@ static int nfs4_xdr_dec_cb_notify_lock(struct rpc_rqst *rqstp,
* };
*/
static void encode_offload_info4(struct xdr_stream *xdr,
__be32 nfserr,
const struct nfsd4_copy *cp)
const struct nfsd4_cb_offload *cbo)
{
__be32 *p;
p = xdr_reserve_space(xdr, 4);
*p++ = nfserr;
if (!nfserr) {
*p = cbo->co_nfserr;
switch (cbo->co_nfserr) {
case nfs_ok:
p = xdr_reserve_space(xdr, 4 + 8 + 4 + NFS4_VERIFIER_SIZE);
p = xdr_encode_empty_array(p);
p = xdr_encode_hyper(p, cp->cp_res.wr_bytes_written);
*p++ = cpu_to_be32(cp->cp_res.wr_stable_how);
p = xdr_encode_opaque_fixed(p, cp->cp_res.wr_verifier.data,
p = xdr_encode_hyper(p, cbo->co_res.wr_bytes_written);
*p++ = cpu_to_be32(cbo->co_res.wr_stable_how);
p = xdr_encode_opaque_fixed(p, cbo->co_res.wr_verifier.data,
NFS4_VERIFIER_SIZE);
} else {
break;
default:
p = xdr_reserve_space(xdr, 8);
/* We always return success if bytes were written */
p = xdr_encode_hyper(p, 0);
@ -710,18 +711,16 @@ static void encode_offload_info4(struct xdr_stream *xdr,
}
static void encode_cb_offload4args(struct xdr_stream *xdr,
__be32 nfserr,
const struct knfsd_fh *fh,
const struct nfsd4_copy *cp,
const struct nfsd4_cb_offload *cbo,
struct nfs4_cb_compound_hdr *hdr)
{
__be32 *p;
p = xdr_reserve_space(xdr, 4);
*p++ = cpu_to_be32(OP_CB_OFFLOAD);
encode_nfs_fh4(xdr, fh);
encode_stateid4(xdr, &cp->cp_res.cb_stateid);
encode_offload_info4(xdr, nfserr, cp);
*p = cpu_to_be32(OP_CB_OFFLOAD);
encode_nfs_fh4(xdr, &cbo->co_fh);
encode_stateid4(xdr, &cbo->co_res.cb_stateid);
encode_offload_info4(xdr, cbo);
hdr->nops++;
}
@ -731,8 +730,8 @@ static void nfs4_xdr_enc_cb_offload(struct rpc_rqst *req,
const void *data)
{
const struct nfsd4_callback *cb = data;
const struct nfsd4_copy *cp =
container_of(cb, struct nfsd4_copy, cp_cb);
const struct nfsd4_cb_offload *cbo =
container_of(cb, struct nfsd4_cb_offload, co_cb);
struct nfs4_cb_compound_hdr hdr = {
.ident = 0,
.minorversion = cb->cb_clp->cl_minorversion,
@ -740,7 +739,7 @@ static void nfs4_xdr_enc_cb_offload(struct rpc_rqst *req,
encode_cb_compound4args(xdr, &hdr);
encode_cb_sequence4args(xdr, cb, &hdr);
encode_cb_offload4args(xdr, cp->nfserr, &cp->fh, cp, &hdr);
encode_cb_offload4args(xdr, cbo, &hdr);
encode_cb_nops(&hdr);
}

44
fs/nfsd/nfs4proc.c
View File

@ -1645,9 +1645,10 @@ nfsd4_cleanup_intra_ssc(struct nfsd_file *src, struct nfsd_file *dst)
static void nfsd4_cb_offload_release(struct nfsd4_callback *cb)
{
struct nfsd4_copy *copy = container_of(cb, struct nfsd4_copy, cp_cb);
struct nfsd4_cb_offload *cbo =
container_of(cb, struct nfsd4_cb_offload, co_cb);
nfs4_put_copy(copy);
kfree(cbo);
}
static int nfsd4_cb_offload_done(struct nfsd4_callback *cb,
@ -1763,25 +1764,23 @@ static void cleanup_async_copy(struct nfsd4_copy *copy)
nfs4_put_copy(copy);
}
static void nfsd4_send_cb_offload(struct nfsd4_copy *copy)
static void nfsd4_send_cb_offload(struct nfsd4_copy *copy, __be32 nfserr)
{
struct nfsd4_copy *cb_copy;
struct nfsd4_cb_offload *cbo;
cb_copy = kzalloc(sizeof(struct nfsd4_copy), GFP_KERNEL);
if (!cb_copy)
cbo = kzalloc(sizeof(*cbo), GFP_KERNEL);
if (!cbo)
return;
refcount_set(&cb_copy->refcount, 1);
memcpy(&cb_copy->cp_res, &copy->cp_res, sizeof(copy->cp_res));
cb_copy->cp_clp = copy->cp_clp;
cb_copy->nfserr = copy->nfserr;
memcpy(&cb_copy->fh, &copy->fh, sizeof(copy->fh));
memcpy(&cbo->co_res, &copy->cp_res, sizeof(copy->cp_res));
memcpy(&cbo->co_fh, &copy->fh, sizeof(copy->fh));
cbo->co_nfserr = nfserr;
nfsd4_init_cb(&cb_copy->cp_cb, cb_copy->cp_clp,
&nfsd4_cb_offload_ops, NFSPROC4_CLNT_CB_OFFLOAD);
trace_nfsd_cb_offload(copy->cp_clp, &copy->cp_res.cb_stateid,
&copy->fh, copy->cp_count, copy->nfserr);
nfsd4_run_cb(&cb_copy->cp_cb);
nfsd4_init_cb(&cbo->co_cb, copy->cp_clp, &nfsd4_cb_offload_ops,
NFSPROC4_CLNT_CB_OFFLOAD);
trace_nfsd_cb_offload(copy->cp_clp, &cbo->co_res.cb_stateid,
&cbo->co_fh, copy->cp_count, nfserr);
nfsd4_run_cb(&cbo->co_cb);
}
/**
@ -1794,6 +1793,7 @@ static void nfsd4_send_cb_offload(struct nfsd4_copy *copy)
static int nfsd4_do_async_copy(void *data)
{
struct nfsd4_copy *copy = (struct nfsd4_copy *)data;
__be32 nfserr;
if (nfsd4_ssc_is_inter(copy)) {
struct file *filp;
@ -1801,21 +1801,21 @@ static int nfsd4_do_async_copy(void *data)
filp = nfs42_ssc_open(copy->ss_mnt, &copy->c_fh,
&copy->stateid);
if (IS_ERR(filp)) {
copy->nfserr = nfserr_offload_denied;
nfserr = nfserr_offload_denied;
nfsd4_interssc_disconnect(copy->ss_mnt);
goto do_callback;
}
copy->nfserr = nfsd4_do_copy(copy, filp,
copy->nf_dst->nf_file, false);
nfserr = nfsd4_do_copy(copy, filp, copy->nf_dst->nf_file,
false);
nfsd4_cleanup_inter_ssc(copy->ss_mnt, filp, copy->nf_dst);
} else {
copy->nfserr = nfsd4_do_copy(copy, copy->nf_src->nf_file,
copy->nf_dst->nf_file, false);
nfserr = nfsd4_do_copy(copy, copy->nf_src->nf_file,
copy->nf_dst->nf_file, false);
nfsd4_cleanup_intra_ssc(copy->nf_src, copy->nf_dst);
}
do_callback:
nfsd4_send_cb_offload(copy);
nfsd4_send_cb_offload(copy, nfserr);
cleanup_async_copy(copy);
return 0;
}

11
fs/nfsd/xdr4.h
View File

@ -533,6 +533,13 @@ struct nfsd42_write_res {
stateid_t cb_stateid;
};
struct nfsd4_cb_offload {
struct nfsd4_callback co_cb;
struct nfsd42_write_res co_res;
__be32 co_nfserr;
struct knfsd_fh co_fh;
};
struct nfsd4_copy {
/* request */
stateid_t cp_src_stateid;
@ -550,10 +557,6 @@ struct nfsd4_copy {
/* response */
struct nfsd42_write_res cp_res;
/* for cb_offload */
struct nfsd4_callback cp_cb;
__be32 nfserr;
struct knfsd_fh fh;
struct nfs4_client *cp_clp;