@@ -2769,6 +2769,22 @@ nfsd4_proc_compound(struct svc_rqst *rqstp)
#define op_encode_channel_attrs_maxsz (6 + 1 + 1)
+/*
+ * The _rsize() helpers are invoked by the NFSv4 COMPOUND decoder, which
+ * is called before sunrpc sets rq_res.buflen. Thus we have to compute
+ * the maximum payload size here, based on transport limits and the size
+ * of the remaining space in the rq_pages array.
+ */
+static u32 nfsd4_max_payload(const struct svc_rqst *rqstp)
+{
+ u32 buflen;
+
+ buflen = (rqstp->rq_page_end - rqstp->rq_next_page) * PAGE_SIZE;
+ buflen -= rqstp->rq_auth_slack;
+ buflen -= rqstp->rq_res.head[0].iov_len;
+ return min_t(u32, buflen, svc_max_payload(rqstp));
+}
+
static u32 nfsd4_only_status_rsize(const struct svc_rqst *rqstp,
const struct nfsd4_op *op)
{
@@ -2814,9 +2830,9 @@ static u32 nfsd4_getattr_rsize(const struct svc_rqst *rqstp,
u32 ret = 0;
if (bmap0 & FATTR4_WORD0_ACL)
- return svc_max_payload(rqstp);
+ return nfsd4_max_payload(rqstp);
if (bmap0 & FATTR4_WORD0_FS_LOCATIONS)
- return svc_max_payload(rqstp);
+ return nfsd4_max_payload(rqstp);
if (bmap1 & FATTR4_WORD1_OWNER) {
ret += IDMAP_NAMESZ + 4;
@@ -2876,10 +2892,7 @@ static u32 nfsd4_open_rsize(const struct svc_rqst *rqstp,
static u32 nfsd4_read_rsize(const struct svc_rqst *rqstp,
const struct nfsd4_op *op)
{
- u32 maxcount = 0, rlen = 0;
-
- maxcount = svc_max_payload(rqstp);
- rlen = min(op->u.read.rd_length, maxcount);
+ u32 rlen = min(op->u.read.rd_length, nfsd4_max_payload(rqstp));
return (op_encode_hdr_size + 2 + XDR_QUADLEN(rlen)) * sizeof(__be32);
}
@@ -2887,8 +2900,7 @@ static u32 nfsd4_read_rsize(const struct svc_rqst *rqstp,
static u32 nfsd4_read_plus_rsize(const struct svc_rqst *rqstp,
const struct nfsd4_op *op)
{
- u32 maxcount = svc_max_payload(rqstp);
- u32 rlen = min(op->u.read.rd_length, maxcount);
+ u32 rlen = min(op->u.read.rd_length, nfsd4_max_payload(rqstp));
/*
* If we detect that the file changed during hole encoding, then we
* recover by encoding the remaining reply as data. This means we need
@@ -2902,10 +2914,7 @@ static u32 nfsd4_read_plus_rsize(const struct svc_rqst *rqstp,
static u32 nfsd4_readdir_rsize(const struct svc_rqst *rqstp,
const struct nfsd4_op *op)
{
- u32 maxcount = 0, rlen = 0;
-
- maxcount = svc_max_payload(rqstp);
- rlen = min(op->u.readdir.rd_maxcount, maxcount);
+ u32 rlen = min(op->u.readdir.rd_maxcount, nfsd4_max_payload(rqstp));
return (op_encode_hdr_size + op_encode_verifier_maxsz +
XDR_QUADLEN(rlen)) * sizeof(__be32);
@@ -3044,10 +3053,7 @@ static u32 nfsd4_copy_notify_rsize(const struct svc_rqst *rqstp,
static u32 nfsd4_getdeviceinfo_rsize(const struct svc_rqst *rqstp,
const struct nfsd4_op *op)
{
- u32 maxcount = 0, rlen = 0;
-
- maxcount = svc_max_payload(rqstp);
- rlen = min(op->u.getdeviceinfo.gd_maxcount, maxcount);
+ u32 rlen = min(op->u.getdeviceinfo.gd_maxcount, nfsd4_max_payload(rqstp));
return (op_encode_hdr_size +
1 /* gd_layout_type*/ +
@@ -3097,10 +3103,7 @@ static u32 nfsd4_seek_rsize(const struct svc_rqst *rqstp,
static u32 nfsd4_getxattr_rsize(const struct svc_rqst *rqstp,
const struct nfsd4_op *op)
{
- u32 maxcount, rlen;
-
- maxcount = svc_max_payload(rqstp);
- rlen = min_t(u32, XATTR_SIZE_MAX, maxcount);
+ u32 rlen = min_t(u32, XATTR_SIZE_MAX, nfsd4_max_payload(rqstp));
return (op_encode_hdr_size + 1 + XDR_QUADLEN(rlen)) * sizeof(__be32);
}
@@ -3114,10 +3117,7 @@ static u32 nfsd4_setxattr_rsize(const struct svc_rqst *rqstp,
static u32 nfsd4_listxattrs_rsize(const struct svc_rqst *rqstp,
const struct nfsd4_op *op)
{
- u32 maxcount, rlen;
-
- maxcount = svc_max_payload(rqstp);
- rlen = min(op->u.listxattrs.lsxa_maxcount, maxcount);
+ u32 rlen = min(op->u.listxattrs.lsxa_maxcount, nfsd4_max_payload(rqstp));
return (op_encode_hdr_size + 4 + XDR_QUADLEN(rlen)) * sizeof(__be32);
}