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nfsd4: convert 4.1 replay encoding 

Limits on maxresp_sz mean that we only ever need to replay rpc's that
are contained entirely in the head.

The one exception is very small zero-copy reads.  That's an odd corner
case as clients wouldn't normally ask those to be cached.

in any case, this seems a little more robust.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
J. Bruce Fields 2014-03-21 17:57:57 -04:00
parent 2825a7f907
commit f5236013a2
3 changed files with 16 additions and 16 deletions
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28
fs/nfsd/nfs4state.c
View File

@ -1560,6 +1560,7 @@ out_err:
void
nfsd4_store_cache_entry(struct nfsd4_compoundres *resp)
{
struct xdr_buf *buf = resp->xdr.buf;
struct nfsd4_slot *slot = resp->cstate.slot;
unsigned int base;
@ -1573,11 +1574,9 @@ nfsd4_store_cache_entry(struct nfsd4_compoundres *resp)
slot->sl_datalen = 0;
return;
}
slot->sl_datalen = (char *)resp->xdr.p - (char *)resp->cstate.datap;
base = (char *)resp->cstate.datap -
(char *)resp->xdr.buf->head[0].iov_base;
if (read_bytes_from_xdr_buf(resp->xdr.buf, base, slot->sl_data,
slot->sl_datalen))
base = resp->cstate.data_offset;
slot->sl_datalen = buf->len - base;
if (read_bytes_from_xdr_buf(buf, base, slot->sl_data, slot->sl_datalen))
WARN("%s: sessions DRC could not cache compound\n", __func__);
return;
}
@ -1618,7 +1617,8 @@ nfsd4_replay_cache_entry(struct nfsd4_compoundres *resp,
struct nfsd4_sequence *seq)
{
struct nfsd4_slot *slot = resp->cstate.slot;
struct kvec *head = resp->xdr.iov;
struct xdr_stream *xdr = &resp->xdr;
__be32 *p;
__be32 status;
dprintk("--> %s slot %p\n", __func__, slot);
@ -1627,16 +1627,16 @@ nfsd4_replay_cache_entry(struct nfsd4_compoundres *resp,
if (status)
return status;
/* The sequence operation has been encoded, cstate->datap set. */
memcpy(resp->cstate.datap, slot->sl_data, slot->sl_datalen);
p = xdr_reserve_space(xdr, slot->sl_datalen);
if (!p) {
WARN_ON_ONCE(1);
return nfserr_serverfault;
}
xdr_encode_opaque_fixed(p, slot->sl_data, slot->sl_datalen);
xdr_commit_encode(xdr);
resp->opcnt = slot->sl_opcnt;
resp->xdr.p = resp->cstate.datap + XDR_QUADLEN(slot->sl_datalen);
head->iov_len = (void *)resp->xdr.p - head->iov_base;
resp->xdr.buf->len = head->iov_len;
status = slot->sl_status;
return status;
return slot->sl_status;
}
/*

2
fs/nfsd/nfs4xdr.c
View File

@ -3659,7 +3659,7 @@ nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
WRITE32(seq->maxslots - 1); /* sr_target_highest_slotid */
WRITE32(seq->status_flags);
resp->cstate.datap = p; /* DRC cache data pointer */
resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */
return 0;
}

2
fs/nfsd/xdr4.h
View File

@ -58,7 +58,7 @@ struct nfsd4_compound_state {
/* For sessions DRC */
struct nfsd4_session *session;
struct nfsd4_slot *slot;
__be32 *datap;
int data_offset;
size_t iovlen;
u32 minorversion;
__be32 status;