pnfs: allow non page aligned pnfs layout segments
Remove alignment checks that would revert to MDS and change pg_test to return the max ammount left in the segment (or other pg_test call) up to size of passed request, or 0 if no space is left. Signed-off-by: Weston Andros Adamson <dros@primarydata.com> Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
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@ -1388,11 +1388,6 @@ pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *r
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WARN_ON_ONCE(pgio->pg_lseg != NULL);
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if (req->wb_offset != req->wb_pgbase) {
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nfs_pageio_reset_read_mds(pgio);
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return;
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}
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if (pgio->pg_dreq == NULL)
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rd_size = i_size_read(pgio->pg_inode) - req_offset(req);
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else
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@ -1417,11 +1412,6 @@ pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio,
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{
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WARN_ON_ONCE(pgio->pg_lseg != NULL);
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if (req->wb_offset != req->wb_pgbase) {
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nfs_pageio_reset_write_mds(pgio);
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return;
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}
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pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
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req->wb_context,
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req_offset(req),
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@ -1443,9 +1433,9 @@ pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev,
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struct nfs_page *req)
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{
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unsigned int size;
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u64 end;
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size = nfs_generic_pg_test(pgio, prev, req);
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if (!size)
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return 0;
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@ -1463,11 +1453,16 @@ pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev,
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* first byte that lies outside the pnfs_layout_range. FIXME?
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*
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*/
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if (req_offset(req) >= end_offset(pgio->pg_lseg->pls_range.offset,
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pgio->pg_lseg->pls_range.length))
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return 0;
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if (pgio->pg_lseg) {
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end = end_offset(pgio->pg_lseg->pls_range.offset,
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pgio->pg_lseg->pls_range.length);
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WARN_ON_ONCE(req_offset(req) > end);
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if (req_offset(req) >= end)
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return 0;
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size = min((unsigned int)(end - req_offset(req)), size);
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}
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return min(size, req->wb_bytes);
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return size;
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}
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EXPORT_SYMBOL_GPL(pnfs_generic_pg_test);
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