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pnfs: allow splicing pre-encoded pages into the layoutcommit args

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Currently there is no XDR buffer space allocated for the per-layout driver
layoutcommit payload, which leads to server buffer overflows in the
blocklayout driver even under simple workloads.  As we can't do per-layout
sizes for XDR operations we'll have to splice a previously encoded list
of pages into the XDR stream, similar to how we handle ACL buffers.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Christoph Hellwig
2014-08-21 11:09:25 -05:00
committed by Trond Myklebust
parent 47abadefad
commit 5f919c9f10
4 changed files with 33 additions and 7 deletions
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18
fs/nfs/nfs4xdr.c
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@ -395,7 +395,10 @@ static int nfs4_stat_to_errno(int);
2 /* last byte written */ + \
1 /* nt_timechanged (false) */ + \
1 /* layoutupdate4 layout type */ + \
1 /* NULL filelayout layoutupdate4 payload */)
1 /* layoutupdate4 opaqueue len */)
/* the actual content of layoutupdate4 should
be allocated by drivers and spliced in
using xdr_write_pages */
#define decode_layoutcommit_maxsz (op_decode_hdr_maxsz + 3)
#define encode_layoutreturn_maxsz (8 + op_encode_hdr_maxsz + \
encode_stateid_maxsz + \
@ -1990,7 +1993,7 @@ encode_layoutget(struct xdr_stream *xdr,
static int
encode_layoutcommit(struct xdr_stream *xdr,
struct inode *inode,
const struct nfs4_layoutcommit_args *args,
struct nfs4_layoutcommit_args *args,
struct compound_hdr *hdr)
{
__be32 *p;
@ -2011,11 +2014,16 @@ encode_layoutcommit(struct xdr_stream *xdr,
*p++ = cpu_to_be32(0); /* Never send time_modify_changed */
*p++ = cpu_to_be32(NFS_SERVER(args->inode)->pnfs_curr_ld->id);/* type */
if (NFS_SERVER(inode)->pnfs_curr_ld->encode_layoutcommit)
if (NFS_SERVER(inode)->pnfs_curr_ld->encode_layoutcommit) {
NFS_SERVER(inode)->pnfs_curr_ld->encode_layoutcommit(
NFS_I(inode)->layout, xdr, args);
else
encode_uint32(xdr, 0); /* no layout-type payload */
} else {
encode_uint32(xdr, args->layoutupdate_len);
if (args->layoutupdate_pages) {
xdr_write_pages(xdr, args->layoutupdate_pages, 0,
args->layoutupdate_len);
}
}
return 0;
}