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NFSD: Update the NFSv3 READDIR3res encoder to use struct xdr_stream

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Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Chuck Lever 2020-10-22 19:31:48 -04:00
parent a1409e2de4
commit e4ccfe3014
3 changed files with 37 additions and 19 deletions
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3
fs/nfsd/nfs3proc.c
View file

@ -447,7 +447,8 @@ static void nfsd3_init_dirlist_pages(struct svc_rqst *rqstp,
* and reserve room for the NULL ptr & eof flag (-2 words) */
resp->buflen = (count >> 2) - 2;
resp->buffer = page_address(*rqstp->rq_next_page);
resp->pages = rqstp->rq_next_page;
resp->buffer = page_address(*resp->pages);
while (count > 0) {
rqstp->rq_next_page++;
count -= PAGE_SIZE;

50
fs/nfsd/nfs3xdr.c
View file

@ -158,6 +158,19 @@ encode_fh(__be32 *p, struct svc_fh *fhp)
return p + XDR_QUADLEN(size);
}
static bool
svcxdr_encode_cookieverf3(struct xdr_stream *xdr, const __be32 *verf)
{
__be32 *p;
p = xdr_reserve_space(xdr, NFS3_COOKIEVERFSIZE);
if (!p)
return false;
memcpy(p, verf, NFS3_COOKIEVERFSIZE);
return true;
}
static bool
svcxdr_encode_writeverf3(struct xdr_stream *xdr, const __be32 *verf)
{
@ -1124,27 +1137,30 @@ nfs3svc_encode_linkres(struct svc_rqst *rqstp, __be32 *p)
int
nfs3svc_encode_readdirres(struct svc_rqst *rqstp, __be32 *p)
{
struct xdr_stream *xdr = &rqstp->rq_res_stream;
struct nfsd3_readdirres *resp = rqstp->rq_resp;
*p++ = resp->status;
p = encode_post_op_attr(rqstp, p, &resp->fh);
if (!svcxdr_encode_nfsstat3(xdr, resp->status))
return 0;
switch (resp->status) {
case nfs_ok:
if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh))
return 0;
if (!svcxdr_encode_cookieverf3(xdr, resp->verf))
return 0;
xdr_write_pages(xdr, resp->pages, 0, resp->count << 2);
/* no more entries */
if (xdr_stream_encode_item_absent(xdr) < 0)
return 0;
if (xdr_stream_encode_bool(xdr, resp->common.err == nfserr_eof) < 0)
return 0;
break;
default:
if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh))
return 0;
}
if (resp->status == 0) {
/* stupid readdir cookie */
memcpy(p, resp->verf, 8); p += 2;
xdr_ressize_check(rqstp, p);
if (rqstp->rq_res.head[0].iov_len + (2<<2) > PAGE_SIZE)
return 1; /*No room for trailer */
rqstp->rq_res.page_len = (resp->count) << 2;
/* add the 'tail' to the end of the 'head' page - page 0. */
rqstp->rq_res.tail[0].iov_base = p;
*p++ = 0; /* no more entries */
*p++ = htonl(resp->common.err == nfserr_eof);
rqstp->rq_res.tail[0].iov_len = 2<<2;
return 1;
} else
return xdr_ressize_check(rqstp, p);
}
static __be32 *

1
fs/nfsd/xdr3.h
View file

@ -176,6 +176,7 @@ struct nfsd3_readdirres {
struct svc_fh scratch;
int count;
__be32 verf[2];
struct page **pages;
struct readdir_cd common;
__be32 * buffer;