[02/17] Fix page allocation flags in grow_dev_page()

[clameter@sgi.com]

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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.

So fix grow_dev_page to do the same as __page_symlink calls. Retrieve the
mask from the mapping and then remove __GFP_FS.

[mm has other changes to this code. Will post a different patch when diffing against mm]

Signed-off-by: Christoph Lameter <clameter@sgi.com>

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

Index: linux-2.6.21-rc7/fs/buffer.c
===================================================================
--- linux-2.6.21-rc7.orig/fs/buffer.c	2007-04-23 15:29:18.000000000 -0700
+++ linux-2.6.21-rc7/fs/buffer.c	2007-04-23 15:29:43.000000000 -0700
@@ -988,7 +988,8 @@ 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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