2 files changed, 8 insertions, 1 deletions

diff --git a/fs/xfs/linux-2.6/xfs_linux.h b/fs/xfs/linux-2.6/xfs_linux.h
index 14d840208e81..2b0e0018738a 100644
--- a/fs/xfs/linux-2.6/xfs_linux.h
+++ b/fs/xfs/linux-2.6/xfs_linux.h
@@ -332,4 +332,11 @@ static inline __uint64_t roundup_64(__uint64_t x, __uint32_t y)
         return(x * y);
 }
 
+static inline __uint64_t howmany_64(__uint64_t x, __uint32_t y)
+{
+        x += y - 1;
+        do_div(x, y);
+        return x;
+}
+
 #endif /* __XFS_LINUX__ */
diff --git a/fs/xfs/xfs_rtalloc.c b/fs/xfs/xfs_rtalloc.c
index e050987afe18..880c73271c05 100644
--- a/fs/xfs/xfs_rtalloc.c
+++ b/fs/xfs/xfs_rtalloc.c
@@ -1948,7 +1948,7 @@ xfs_growfs_rt(
          */
         nrextents = nrblocks;
         do_div(nrextents, in->extsize);
-        nrbmblocks = roundup_64(nrextents, NBBY * sbp->sb_blocksize);
+        nrbmblocks = howmany_64(nrextents, NBBY * sbp->sb_blocksize);
         nrextslog = xfs_highbit32(nrextents);
         nrsumlevels = nrextslog + 1;
         nrsumsize = (uint)sizeof(xfs_suminfo_t) * nrsumlevels * nrbmblocks;