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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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3
include/linux/nfs_xdr.h
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@@ -279,6 +279,9 @@ struct nfs4_layoutcommit_args {
__u64 lastbytewritten;
struct inode *inode;
const u32 *bitmask;
size_t layoutupdate_len;
struct page *layoutupdate_page;
struct page **layoutupdate_pages;
};
struct nfs4_layoutcommit_res {