linux-kernel - Re: [PATCH 1/1 2.6.20-rc2] MM: ramfs breaks without CONFIG

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Date:	Wed, 27 Dec 2006 01:03:48 -0800
From:	Andrew Morton <akpm@...l.org>
To:	dimitri.gorokhovik@...e.fr
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1 2.6.20-rc2] MM: ramfs breaks without CONFIG_BLOCK

On Tue, 26 Dec 2006 18:09:47 +0100
dimitri.gorokhovik@...e.fr wrote:

> From: Dimitri Gorokhovik <dimitri.gorokhovik@...e.fr>
> 
> ramfs doesn't provide the .set_dirty_page a_op, and when the BLOCK
> layer is not configured in, 'set_page_dirty' makes a call via a NULL
> pointer.

OK.  But I think it'd be better to fill in the address_space_operations:


From: Dimitri Gorokhovik <dimitri.gorokhovik@...e.fr>

ramfs doesn't provide the .set_dirty_page a_op, and when the BLOCK layer is
not configured in, 'set_page_dirty' makes a call via a NULL pointer.

Signed-off-by: Dimitri Gorokhovik <dimitri.gorokhovik@...e.fr>
Cc: <stable@...nel.org>
Signed-off-by: Andrew Morton <akpm@...l.org>
---

 fs/ramfs/file-mmu.c   |    4 +++-
 fs/ramfs/file-nommu.c |    4 +++-
 2 files changed, 6 insertions(+), 2 deletions(-)

diff -puN fs/ramfs/file-mmu.c~mm-ramfs-breaks-without-config_block fs/ramfs/file-mmu.c
--- a/fs/ramfs/file-mmu.c~mm-ramfs-breaks-without-config_block
+++ a/fs/ramfs/file-mmu.c
@@ -25,11 +25,13 @@
  */
 
 #include <linux/fs.h>
+#include <linux/mm.h>
 
 const struct address_space_operations ramfs_aops = {
 	.readpage	= simple_readpage,
 	.prepare_write	= simple_prepare_write,
-	.commit_write	= simple_commit_write
+	.commit_write	= simple_commit_write,
+	.set_page_dirty = __set_page_dirty_nobuffers,
 };
 
 const struct file_operations ramfs_file_operations = {
diff -puN fs/ramfs/file-nommu.c~mm-ramfs-breaks-without-config_block fs/ramfs/file-nommu.c
--- a/fs/ramfs/file-nommu.c~mm-ramfs-breaks-without-config_block
+++ a/fs/ramfs/file-nommu.c
@@ -11,6 +11,7 @@
 
 #include <linux/module.h>
 #include <linux/fs.h>
+#include <linux/mm.h>
 #include <linux/pagemap.h>
 #include <linux/highmem.h>
 #include <linux/init.h>
@@ -30,7 +31,8 @@ static int ramfs_nommu_setattr(struct de
 const struct address_space_operations ramfs_aops = {
 	.readpage		= simple_readpage,
 	.prepare_write		= simple_prepare_write,
-	.commit_write		= simple_commit_write
+	.commit_write		= simple_commit_write,
+	.set_page_dirty = __set_page_dirty_nobuffers,
 };
 
 const struct file_operations ramfs_file_operations = {
_

-
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