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-rw-r--r--fs/nfs/nfs4filelayout.c34
1 files changed, 34 insertions, 0 deletions
diff --git a/fs/nfs/nfs4filelayout.c b/fs/nfs/nfs4filelayout.c
index 0efe8cbd9e3c..ed833705dcee 100644
--- a/fs/nfs/nfs4filelayout.c
+++ b/fs/nfs/nfs4filelayout.c
@@ -66,6 +66,40 @@ filelayout_clear_layoutdriver(struct nfs_server *nfss)
return 0;
}
+static loff_t
+filelayout_get_dense_offset(struct nfs4_filelayout_segment *flseg,
+ loff_t offset)
+{
+ u32 stripe_width = flseg->stripe_unit * flseg->dsaddr->stripe_count;
+ u64 tmp;
+
+ offset -= flseg->pattern_offset;
+ tmp = offset;
+ do_div(tmp, stripe_width);
+
+ return tmp * flseg->stripe_unit + do_div(offset, flseg->stripe_unit);
+}
+
+/* This function is used by the layout driver to calculate the
+ * offset of the file on the dserver based on whether the
+ * layout type is STRIPE_DENSE or STRIPE_SPARSE
+ */
+static loff_t
+filelayout_get_dserver_offset(struct pnfs_layout_segment *lseg, loff_t offset)
+{
+ struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg);
+
+ switch (flseg->stripe_type) {
+ case STRIPE_SPARSE:
+ return offset;
+
+ case STRIPE_DENSE:
+ return filelayout_get_dense_offset(flseg, offset);
+ }
+
+ BUG();
+}
+
/*
* filelayout_check_layout()
*
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