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NFSD: Refactor nfsd4_encode_lock_denied()

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Use the modern XDR utility functions.

The LOCK and LOCKT encoder functions need to return nfserr_denied
when a lock is denied, but nfsd4_encode_lock4denied() should return
a status code that is consistent with other XDR encoders.

Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Chuck Lever 2023-09-29 09:58:59 -04:00
parent c4a29c5250
commit c564178290
1 changed files with 36 additions and 25 deletions
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61
fs/nfsd/nfs4xdr.c
View file

@ -3994,28 +3994,26 @@ nfsd4_encode_lock_owner4(struct xdr_stream *xdr, const clientid_t *clientid,
return nfsd4_encode_opaque(xdr, owner->data, owner->len);
}
/*
* Including all fields other than the name, a LOCK4denied structure requires
* 8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
*/
static __be32
nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld)
nfsd4_encode_lock4denied(struct xdr_stream *xdr,
const struct nfsd4_lock_denied *ld)
{
__be32 *p, status;
__be32 status;
p = xdr_reserve_space(xdr, XDR_UNIT * 5);
if (!p)
return nfserr_resource;
p = xdr_encode_hyper(p, ld->ld_start);
p = xdr_encode_hyper(p, ld->ld_length);
*p++ = cpu_to_be32(ld->ld_type);
status = nfsd4_encode_lock_owner4(xdr, &ld->ld_clientid,
&ld->ld_owner);
/* offset */
status = nfsd4_encode_offset4(xdr, ld->ld_start);
if (status != nfs_ok)
return status;
return nfserr_denied;
/* length */
status = nfsd4_encode_length4(xdr, ld->ld_length);
if (status != nfs_ok)
return status;
/* locktype */
if (xdr_stream_encode_u32(xdr, ld->ld_type) != XDR_UNIT)
return nfserr_resource;
/* owner */
return nfsd4_encode_lock_owner4(xdr, &ld->ld_clientid,
&ld->ld_owner);
}
static __be32
@ -4024,13 +4022,21 @@ nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr,
{
struct nfsd4_lock *lock = &u->lock;
struct xdr_stream *xdr = resp->xdr;
__be32 status;
if (!nfserr)
nfserr = nfsd4_encode_stateid4(xdr, &lock->lk_resp_stateid);
else if (nfserr == nfserr_denied)
nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied);
return nfserr;
switch (nfserr) {
case nfs_ok:
/* resok4 */
status = nfsd4_encode_stateid4(xdr, &lock->lk_resp_stateid);
break;
case nfserr_denied:
/* denied */
status = nfsd4_encode_lock4denied(xdr, &lock->lk_denied);
break;
default:
return nfserr;
}
return status != nfs_ok ? status : nfserr;
}
static __be32
@ -4039,9 +4045,14 @@ nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr,
{
struct nfsd4_lockt *lockt = &u->lockt;
struct xdr_stream *xdr = resp->xdr;
__be32 status;
if (nfserr == nfserr_denied)
nfsd4_encode_lock_denied(xdr, &lockt->lt_denied);
if (nfserr == nfserr_denied) {
/* denied */
status = nfsd4_encode_lock4denied(xdr, &lockt->lt_denied);
if (status != nfs_ok)
return status;
}
return nfserr;
}