nfs: fix a minor do_div portability issue

This change modifies filelayout_get_dense_offset() to use the functions
in math64.h and thus avoid a 32-bit platform compile error trying to
use do_div() on an s64 type.

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
Reviewed-by: Boaz Harrosh <bharrosh@panasas.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 5 insertions, 4 deletions

diff --git a/fs/nfs/nfs4filelayout.c b/fs/nfs/nfs4filelayout.c
index a62d36b9a99e..71ec08617e23 100644
--- a/fs/nfs/nfs4filelayout.c
+++ b/fs/nfs/nfs4filelayout.c
@@ -49,13 +49,14 @@ filelayout_get_dense_offset(struct nfs4_filelayout_segment *flseg,
                             loff_t offset)
 {
         u32 stripe_width = flseg->stripe_unit * flseg->dsaddr->stripe_count;
-        u64 tmp;
+        u64 stripe_no;
+        u32 rem;
 
         offset -= flseg->pattern_offset;
-        tmp = offset;
-        do_div(tmp, stripe_width);
+        stripe_no = div_u64(offset, stripe_width);
+        div_u64_rem(offset, flseg->stripe_unit, &rem);
 
-        return tmp * flseg->stripe_unit + do_div(offset, flseg->stripe_unit);
+        return stripe_no * flseg->stripe_unit + rem;
 }
 
 /* This function is used by the layout driver to calculate the