From: "J. Bruce Fields" <bfields@xxxxxxxxxx>
It will turn out to be useful to have a more accurate estimate of reply
size; so, piggyback on the existing op reply-size estimators.
Also move nfsd4_max_reply to nfs4proc.c to get easier access to struct
nfsd4_operation and friends. (Thanks to Christoph Hellwig for pointing
out that simplification.)
Signed-off-by: J. Bruce Fields <bfields@xxxxxxxxxx>
---
fs/nfsd/nfs4proc.c | 12 ++++++++++++
fs/nfsd/nfs4xdr.c | 35 ++++-------------------------------
fs/nfsd/xdr4.h | 1 +
3 files changed, 17 insertions(+), 31 deletions(-)
diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index 1326a0b..e1196ed 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -1856,6 +1856,18 @@ static struct nfsd4_operation nfsd4_ops[] = {
},
};
+int nfsd4_max_reply(struct svc_rqst *rqstp, struct nfsd4_op *op)
+{
+ struct nfsd4_operation *opdesc;
+ nfsd4op_rsize estimator;
+
+ if (op->opnum == OP_ILLEGAL)
+ return op_encode_hdr_size;
+ opdesc = OPDESC(op);
+ estimator = opdesc->op_rsize_bop;
+ return estimator ? estimator(rqstp, op) : PAGE_SIZE;
+}
+
void warn_on_nonidempotent_op(struct nfsd4_op *op)
{
if (OPDESC(op)->op_flags & OP_MODIFIES_SOMETHING) {
diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index 4c2f866..4877abb 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -1605,40 +1605,13 @@ nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op)
return true;
}
-/*
- * Return a rough estimate of the maximum possible reply size. Note the
- * estimate includes rpc headers so is meant to be passed to
- * svc_reserve, not svc_reserve_auth.
- *
- * Also note the current compound encoding permits only one operation to
- * use pages beyond the first one, so the maximum possible length is the
- * maximum over these values, not the sum.
- */
-static int nfsd4_max_reply(u32 opnum)
-{
- switch (opnum) {
- case OP_READLINK:
- case OP_READDIR:
- /*
- * Both of these ops take a single page for data and put
- * the head and tail in another page:
- */
- return 2 * PAGE_SIZE;
- case OP_GETATTR:
- case OP_READ:
- return INT_MAX;
- default:
- return PAGE_SIZE;
- }
-}
-
static __be32
nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
{
DECODE_HEAD;
struct nfsd4_op *op;
bool cachethis = false;
- int max_reply = PAGE_SIZE;
+ int max_reply = 2 * RPC_MAX_AUTH_SIZE + 8; /* opcnt, status */
int i;
READ_BUF(4);
@@ -1647,6 +1620,7 @@ nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
SAVEMEM(argp->tag, argp->taglen);
READ32(argp->minorversion);
READ32(argp->opcnt);
+ max_reply += 4 + (XDR_QUADLEN(argp->taglen) << 2);
if (argp->taglen > NFSD4_MAX_TAGLEN)
goto xdr_error;
@@ -1684,7 +1658,7 @@ nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
*/
cachethis |= nfsd4_cache_this_op(op);
- max_reply = max(max_reply, nfsd4_max_reply(op->opnum));
+ max_reply += nfsd4_max_reply(argp->rqstp, op);
if (op->status) {
argp->opcnt = i+1;
@@ -1694,8 +1668,7 @@ nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
/* Sessions make the DRC unnecessary: */
if (argp->minorversion)
cachethis = false;
- if (max_reply != INT_MAX)
- svc_reserve(argp->rqstp, max_reply);
+ svc_reserve(argp->rqstp, max_reply);
argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
DECODE_TAIL;
diff --git a/fs/nfsd/xdr4.h b/fs/nfsd/xdr4.h
index ee9ffdc..41e5229 100644
--- a/fs/nfsd/xdr4.h
+++ b/fs/nfsd/xdr4.h
@@ -536,6 +536,7 @@ static inline bool nfsd4_last_compound_op(struct svc_rqst *rqstp)
return argp->opcnt == resp->opcnt;
}
+int nfsd4_max_reply(struct svc_rqst *rqstp, struct nfsd4_op *op);
void warn_on_nonidempotent_op(struct nfsd4_op *op);
#define NFS4_SVC_XDRSIZE sizeof(struct nfsd4_compoundargs)
--
1.9.0
--
To unsubscribe from this list: send the line "unsubscribe linux-nfs" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
