Index: sys/kern/vfs_bio.c
===================================================================
--- sys/kern/vfs_bio.c
+++ sys/kern/vfs_bio.c
@@ -4175,19 +4175,6 @@
 static void
 vfs_nonvmio_truncate(struct buf *bp, int newbsize)
 {
-
-	if (bp->b_flags & B_MALLOC) {
-		/*
-		 * malloced buffers are not shrunk
-		 */
-		if (newbsize == 0) {
-			bufmallocadjust(bp, 0);
-			free(bp->b_data, M_BIOBUF);
-			bp->b_data = bp->b_kvabase;
-			bp->b_flags &= ~B_MALLOC;
-		}
-		return;
-	}
 	vm_hold_free_pages(bp, newbsize);
 	bufspace_adjust(bp, newbsize);
 }
@@ -4198,48 +4185,8 @@
 static void
 vfs_nonvmio_extend(struct buf *bp, int newbsize)
 {
-	caddr_t origbuf;
-	int origbufsize;
-
-	/*
-	 * We only use malloced memory on the first allocation.
-	 * and revert to page-allocated memory when the buffer
-	 * grows.
-	 *
-	 * There is a potential smp race here that could lead
-	 * to bufmallocspace slightly passing the max.  It
-	 * is probably extremely rare and not worth worrying
-	 * over.
-	 */
-	if (bp->b_bufsize == 0 && newbsize <= PAGE_SIZE/2 &&
-	    bufmallocspace < maxbufmallocspace) {
-		bp->b_data = malloc(newbsize, M_BIOBUF, M_WAITOK);
-		bp->b_flags |= B_MALLOC;
-		bufmallocadjust(bp, newbsize);
-		return;
-	}
-
-	/*
-	 * If the buffer is growing on its other-than-first
-	 * allocation then we revert to the page-allocation
-	 * scheme.
-	 */
-	origbuf = NULL;
-	origbufsize = 0;
-	if (bp->b_flags & B_MALLOC) {
-		origbuf = bp->b_data;
-		origbufsize = bp->b_bufsize;
-		bp->b_data = bp->b_kvabase;
-		bufmallocadjust(bp, 0);
-		bp->b_flags &= ~B_MALLOC;
-		newbsize = round_page(newbsize);
-	}
 	vm_hold_load_pages(bp, (vm_offset_t) bp->b_data + bp->b_bufsize,
 	    (vm_offset_t) bp->b_data + newbsize);
-	if (origbuf != NULL) {
-		bcopy(origbuf, bp->b_data, origbufsize);
-		free(origbuf, M_BIOBUF);
-	}
 	bufspace_adjust(bp, newbsize);
 }