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NFSD: Add nfsd4_encode_lock_owner4()

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To improve readability and better align the LOCK encoders with the
XDR specification, add an explicit encoder named for the lock_owner4
type.

In particular, to avoid code duplication, use
nfsd4_encode_clientid4() to encode the clientid in the lock owner
rather than open-coding it.

It looks to me like nfs4_set_lock_denied() already clears the
clientid if it won't return an owner (cf: the nevermind: label). The
code in the XDR encoder appears to be redundant and can safely be
removed.

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 09:58:53 -04:00
parent 92d82e995e
commit c4a29c5250
1 changed files with 21 additions and 10 deletions
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31
fs/nfsd/nfs4xdr.c
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@ -3980,6 +3980,20 @@ nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr,
return nfsd4_encode_nfs_fh4(xdr, &fhp->fh_handle);
}
static __be32
nfsd4_encode_lock_owner4(struct xdr_stream *xdr, const clientid_t *clientid,
const struct xdr_netobj *owner)
{
__be32 status;
/* clientid */
status = nfsd4_encode_clientid4(xdr, clientid);
if (status != nfs_ok)
return status;
/* owner */
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.
@ -3987,23 +4001,20 @@ nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr,
static __be32
nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld)
{
struct xdr_netobj *conf = &ld->ld_owner;
__be32 *p;
__be32 *p, status;
p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len));
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);
if (conf->len) {
p = xdr_encode_opaque_fixed(p, &ld->ld_clientid, 8);
p = xdr_encode_opaque(p, conf->data, conf->len);
} else { /* non - nfsv4 lock in conflict, no clientid nor owner */
p = xdr_encode_hyper(p, (u64)0); /* clientid */
*p++ = cpu_to_be32(0); /* length of owner name */
}
status = nfsd4_encode_lock_owner4(xdr, &ld->ld_clientid,
&ld->ld_owner);
if (status != nfs_ok)
return status;
return nfserr_denied;
}