linux-kernel - Re: [PATCH v5 3/3] fadvise: implement POSIX_FADV

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Message-ID: <20120215233537.GA20724@dev3310.snc6.facebook.com>
Date:	Wed, 15 Feb 2012 15:35:37 -0800
From:	Arun Sharma <asharma@...com>
To:	Andrea Righi <andrea@...terlinux.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Minchan Kim <minchan.kim@...il.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Johannes Weiner <jweiner@...hat.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Rik van Riel <riel@...hat.com>,
	Hugh Dickins <hughd@...gle.com>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Shaohua Li <shaohua.li@...el.com>,
	Pádraig Brady <P@...igBrady.com>,
	John Stultz <john.stultz@...aro.org>,
	Jerry James <jamesjer@...terlinux.com>,
	Julius Plenz <julius@...nz.com>, linux-mm <linux-mm@...ck.org>,
	linux-fsdevel@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 3/3] fadvise: implement POSIX_FADV_NOREUSE

On Sun, Feb 12, 2012 at 01:21:38AM +0100, Andrea Righi wrote:
> diff --git a/include/linux/fs.h b/include/linux/fs.h
> index 386da09..624a73e 100644
> --- a/include/linux/fs.h
> +++ b/include/linux/fs.h
> @@ -9,6 +9,7 @@
>  #include <linux/limits.h>
>  #include <linux/ioctl.h>
>  #include <linux/blk_types.h>
> +#include <linux/kinterval.h>
>  #include <linux/types.h>

fs.h is an exported header file, whereas kinterval.h is not. So this
fails scripts/header_check.pl.

I used the workaround below.

 -Arun

diff --git a/fs/inode.c b/fs/inode.c
index d27dbee..1335a5f 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -26,6 +26,7 @@
 #include <linux/ima.h>
 #include <linux/cred.h>
 #include <linux/buffer_head.h> /* for inode_has_buffers */
+#include <linux/kinterval.h>
 #include "internal.h"
 
 /*
@@ -279,7 +280,7 @@ void address_space_init_once(struct address_space *mapping)
 	spin_lock_init(&mapping->private_lock);
 	INIT_RAW_PRIO_TREE_ROOT(&mapping->i_mmap);
 	INIT_LIST_HEAD(&mapping->i_mmap_nonlinear);
-	INIT_KINTERVAL_TREE_ROOT(&mapping->nocache_tree);
+	INIT_KINTERVAL_TREE_ROOT((struct rb_root *) &mapping->nocache_tree);
 	rwlock_init(&mapping->nocache_lock);
 }
 EXPORT_SYMBOL(address_space_init_once);
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 74b6a97..b4e45e6 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -9,7 +9,6 @@
 #include <linux/limits.h>
 #include <linux/ioctl.h>
 #include <linux/blk_types.h>
-#include <linux/kinterval.h>
 #include <linux/types.h>
 
 /*
@@ -656,7 +655,7 @@ struct address_space {
 	spinlock_t		private_lock;	/* for use by the address_space */
 	struct list_head	private_list;	/* ditto */
 	struct address_space	*assoc_mapping;	/* ditto */
-	struct rb_root		nocache_tree;	/* noreuse cache range tree */
+	void			*nocache_tree;	/* noreuse cache range tree */
 	rwlock_t		nocache_lock;	/* protect the nocache_tree */
 } __attribute__((aligned(sizeof(long))));
 	/*
--
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