linux-kernel - [PATCH 3/3] Export of hugetlb_file

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Date:	Mon, 14 Sep 2009 17:20:02 +1200
From:	Alexey Korolev <akorolex@...il.com>
To:	Mel Gorman <mel@....ul.ie>, Eric Munson <linux-mm@...bm.net>,
	Alexey Korolev <akorolev@...radead.org>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: [PATCH 3/3] Export of hugetlb_file_setup function. (Take 3)

This patch provides drivers with export of hugetlb_file_setup function.
This patch exports hugetlb_file_setup function, that will be used to
create a file on the internal vfsmount. Also it adds enum entry just
to notify that  file is created by device driver. Accounting rules are
the same as for HUGETLB_ANONHUGE_INODE.

fs/hugetlbfs/inode.c    |    1 +
include/linux/hugetlb.h |    5 +++++
2 files changed, 6 insertions(+)
---
Signed-off-by: Alexey Korolev <akorolev@...radead.org>

diff -aurp clean/fs/hugetlbfs/inode.c patched/fs/hugetlbfs/inode.c
--- clean/fs/hugetlbfs/inode.c	2009-09-11 15:33:48.000000000 +1200
+++ patched/fs/hugetlbfs/inode.c	2009-09-11 15:29:31.000000000 +1200
@@ -1012,6 +1012,7 @@ out_shm_unlock:
 	}
 	return ERR_PTR(error);
 }
+EXPORT_SYMBOL_GPL(hugetlb_file_setup);

 static int __init init_hugetlbfs_fs(void)
 {
diff -aurp clean/include/linux/hugetlb.h patched/include/linux/hugetlb.h
--- clean/include/linux/hugetlb.h	2009-09-11 15:33:48.000000000 +1200
+++ patched/include/linux/hugetlb.h	2009-09-11 20:09:02.000000000 +1200
@@ -123,6 +126,11 @@ enum {
 	 * accounting rules do not apply
 	 */
 	HUGETLB_ANONHUGE_INODE  = 2,
+	/*
+	 * The file is being created for use of device drivers,shmfs
+	 * accounting rules do not apply
+	 */
+	HUGETLB_DEVBACK_INODE	= 3,
 };

 #ifdef CONFIG_HUGETLBFS
--
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