xfs: merge xfs_buf_allocate_memory

It only has one caller and is now a simple function, so merge it
into the caller.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>

fs/xfs/xfs_buf.c

@@ -313,11 +313,11 @@ xfs_buf_free(
 static int
 xfs_buf_alloc_kmem(
 	struct xfs_buf	*bp,
-	size_t		size,
 	xfs_buf_flags_t	flags)
 {
 	int		align_mask = xfs_buftarg_dma_alignment(bp->b_target);
 	xfs_km_flags_t	kmflag_mask = KM_NOFS;
+	size_t		size = BBTOB(bp->b_length);
 
 	/* Assure zeroed buffer for non-read cases. */
 	if (!(flags & XBF_READ))
@@ -400,33 +400,6 @@ xfs_buf_alloc_pages(
 	return 0;
 }
 
-
-/*
- * Allocates all the pages for buffer in question and builds it's page list.
- */
-static int
-xfs_buf_allocate_memory(
-	struct xfs_buf		*bp,
-	uint			flags)
-{
-	size_t			size;
-	int			error;
-
-	/*
-	 * For buffers that fit entirely within a single page, first attempt to
-	 * allocate the memory from the heap to minimise memory usage. If we
-	 * can't get heap memory for these small buffers, we fall back to using
-	 * the page allocator.
-	 */
-	size = BBTOB(bp->b_length);
-	if (size < PAGE_SIZE) {
-		error = xfs_buf_alloc_kmem(bp, size, flags);
-		if (!error)
-			return 0;
-	}
-	return xfs_buf_alloc_pages(bp, flags);
-}
-
 /*
  *	Map buffer into kernel address-space if necessary.
  */
@@ -688,9 +661,18 @@ xfs_buf_get_map(
 	if (error)
 		return error;
 
-	error = xfs_buf_allocate_memory(new_bp, flags);
+	/*
+	 * For buffers that fit entirely within a single page, first attempt to
+	 * allocate the memory from the heap to minimise memory usage. If we
+	 * can't get heap memory for these small buffers, we fall back to using
+	 * the page allocator.
+	 */
+	if (BBTOB(new_bp->b_length) >= PAGE_SIZE ||
+	    xfs_buf_alloc_kmem(new_bp, flags) < 0) {
+		error = xfs_buf_alloc_pages(new_bp, flags);
 		if (error)
 			goto out_free_buf;
+	}
 
 	error = xfs_buf_find(target, map, nmaps, flags, new_bp, &bp);
 	if (error)