Fix page allocation flags in grow_dev_page()

[Christoph Lameter <clameter@sgi.com>]

Grow dev page simply passes GFP_NOFS to find_or_create_page. This means the
allocation of radix tree nodes is done with GFP_NOFS and the allocation
of a new page is done using GFP_NOFS.

The mapping has a flags field that contains the necessary allocation flags for
the page cache allocation. These need to be consulted in order to get DMA
and HIGHMEM allocations etc right. And yes a blockdev could be allowing
Highmem allocations if its a ramdisk.

Cc: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Christoph Lameter <clameter@sgi.com>

---
 fs/buffer.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

Index: vps/fs/buffer.c
===================================================================
--- vps.orig/fs/buffer.c	2007-05-15 15:47:32.000000000 -0700
+++ vps/fs/buffer.c	2007-05-15 15:48:36.000000000 -0700
@@ -981,7 +981,8 @@ grow_dev_page(struct block_device *bdev,
 	struct page *page;
 	struct buffer_head *bh;
 
-	page = find_or_create_page(inode->i_mapping, index, GFP_NOFS);
+	page = find_or_create_page(inode->i_mapping, index,
+		mapping_gfp_mask(inode->i_mapping) & ~__GFP_FS);
 	if (!page)
 		return NULL;
 

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