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pnfs: allow splicing pre-encoded pages into the layoutcommit args
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>
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@ -395,7 +395,10 @@ static int nfs4_stat_to_errno(int);
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2 /* last byte written */ + \
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1 /* nt_timechanged (false) */ + \
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1 /* layoutupdate4 layout type */ + \
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1 /* NULL filelayout layoutupdate4 payload */)
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1 /* layoutupdate4 opaqueue len */)
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/* the actual content of layoutupdate4 should
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be allocated by drivers and spliced in
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using xdr_write_pages */
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#define decode_layoutcommit_maxsz (op_decode_hdr_maxsz + 3)
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#define encode_layoutreturn_maxsz (8 + op_encode_hdr_maxsz + \
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encode_stateid_maxsz + \
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@ -1990,7 +1993,7 @@ encode_layoutget(struct xdr_stream *xdr,
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static int
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encode_layoutcommit(struct xdr_stream *xdr,
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struct inode *inode,
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const struct nfs4_layoutcommit_args *args,
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struct nfs4_layoutcommit_args *args,
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struct compound_hdr *hdr)
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{
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__be32 *p;
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@ -2011,11 +2014,16 @@ encode_layoutcommit(struct xdr_stream *xdr,
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*p++ = cpu_to_be32(0); /* Never send time_modify_changed */
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*p++ = cpu_to_be32(NFS_SERVER(args->inode)->pnfs_curr_ld->id);/* type */
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if (NFS_SERVER(inode)->pnfs_curr_ld->encode_layoutcommit)
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if (NFS_SERVER(inode)->pnfs_curr_ld->encode_layoutcommit) {
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NFS_SERVER(inode)->pnfs_curr_ld->encode_layoutcommit(
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NFS_I(inode)->layout, xdr, args);
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else
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encode_uint32(xdr, 0); /* no layout-type payload */
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} else {
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encode_uint32(xdr, args->layoutupdate_len);
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if (args->layoutupdate_pages) {
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xdr_write_pages(xdr, args->layoutupdate_pages, 0,
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args->layoutupdate_len);
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}
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}
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return 0;
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}
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@ -1854,6 +1854,7 @@ void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data)
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int
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pnfs_layoutcommit_inode(struct inode *inode, bool sync)
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{
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struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
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struct nfs4_layoutcommit_data *data;
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struct nfs_inode *nfsi = NFS_I(inode);
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loff_t end_pos;
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@ -1904,6 +1905,20 @@ pnfs_layoutcommit_inode(struct inode *inode, bool sync)
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data->args.lastbytewritten = end_pos - 1;
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data->res.server = NFS_SERVER(inode);
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if (ld->prepare_layoutcommit) {
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status = ld->prepare_layoutcommit(&data->args);
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if (status) {
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spin_lock(&inode->i_lock);
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if (end_pos < nfsi->layout->plh_lwb)
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nfsi->layout->plh_lwb = end_pos;
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spin_unlock(&inode->i_lock);
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put_rpccred(data->cred);
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set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags);
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goto clear_layoutcommitting;
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}
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}
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status = nfs4_proc_layoutcommit(data, sync);
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out:
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if (status)
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@ -128,8 +128,8 @@ struct pnfs_layoutdriver_type {
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const struct nfs4_layoutreturn_args *args);
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void (*cleanup_layoutcommit) (struct nfs4_layoutcommit_data *data);
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void (*encode_layoutcommit) (struct pnfs_layout_hdr *layoutid,
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int (*prepare_layoutcommit) (struct nfs4_layoutcommit_args *args);
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void (*encode_layoutcommit) (struct pnfs_layout_hdr *lo,
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struct xdr_stream *xdr,
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const struct nfs4_layoutcommit_args *args);
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};
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@ -279,6 +279,9 @@ struct nfs4_layoutcommit_args {
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__u64 lastbytewritten;
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struct inode *inode;
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const u32 *bitmask;
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size_t layoutupdate_len;
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struct page *layoutupdate_page;
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struct page **layoutupdate_pages;
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};
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struct nfs4_layoutcommit_res {
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