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pnfs: serialize LAYOUTGET(openstateid)

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We shouldn't send a LAYOUTGET(openstateid) unless all outstanding RPCs
using the previous stateid are completed.  This requires choosing the
stateid to encode earlier, so we can abort if one is not available (we
want to use the open stateid, but a LAYOUTGET is already out using
it), and adding a count of the number of outstanding rpc calls using
layout state (which for now consist solely of LAYOUTGETs).

Signed-off-by: Fred Isaman <iisaman@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Fred Isaman
2011-01-06 11:36:25 +00:00
committed by Trond Myklebust
parent c31663d4a1
commit cf7d63f1f9
5 changed files with 28 additions and 10 deletions
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5
fs/nfs/nfs4xdr.c
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@@ -1787,7 +1787,6 @@ encode_layoutget(struct xdr_stream *xdr,
const struct nfs4_layoutget_args *args,
struct compound_hdr *hdr)
{
nfs4_stateid stateid;
__be32 *p;
p = reserve_space(xdr, 44 + NFS4_STATEID_SIZE);
@@ -1798,9 +1797,7 @@ encode_layoutget(struct xdr_stream *xdr,
p = xdr_encode_hyper(p, args->range.offset);
p = xdr_encode_hyper(p, args->range.length);
p = xdr_encode_hyper(p, args->minlength);
pnfs_choose_layoutget_stateid(&stateid, NFS_I(args->inode)->layout,
args->ctx->state);
p = xdr_encode_opaque_fixed(p, &stateid.data, NFS4_STATEID_SIZE);
p = xdr_encode_opaque_fixed(p, &args->stateid.data, NFS4_STATEID_SIZE);
*p = cpu_to_be32(args->maxcount);
dprintk("%s: 1st type:0x%x iomode:%d off:%lu len:%lu mc:%d\n",