linux-kernel - [PATCH 1/1] VFS: introduce s

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1276167393-31492-2-git-send-email-dedekind1@gmail.com>
Date:	Thu, 10 Jun 2010 13:56:33 +0300
From:	Artem Bityutskiy <dedekind1@...il.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Al Viro <viro@...IV.linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>, tytso@....edu,
	linux-fsdevel@...r.kernel.org
Subject: [PATCH 1/1] VFS: introduce s_dirty accessors

From: Artem Bityutskiy <Artem.Bityutskiy@...ia.com>

This patch introduces 3 VFS accessors: 'sb_mark_dirty()',
'sb_mark_clean()', and 'sb_is_dirty()'. They simply
set 'sb->s_dirt' or test 'sb->s_dirt'. The plan is to make
every FS use these accessors later instead of manipulating
the 'sb->s_dirt' flag directly.

Ultimately, this change is a preparation for the periodic
superblock synchronization optimization which is about
preventing the "sync_supers" kernel thread from waking up
even if there is nothing to synchronize.

This patch does not do any functional change, just adds
accessor functions.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@...ia.com>
---
 include/linux/fs.h |   13 +++++++++++++
 1 files changed, 13 insertions(+), 0 deletions(-)

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 471e1ff..68ca1b0 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1783,6 +1783,19 @@ extern int get_sb_pseudo(struct file_system_type *, char *,
 	struct vfsmount *mnt);
 extern void simple_set_mnt(struct vfsmount *mnt, struct super_block *sb);
 
+static inline void sb_mark_dirty(struct super_block *sb)
+{
+	sb->s_dirt = 1;
+}
+static inline void sb_mark_clean(struct super_block *sb)
+{
+	sb->s_dirt = 0;
+}
+static inline int sb_is_dirty(struct super_block *sb)
+{
+	return sb->s_dirt;
+}
+
 /* Alas, no aliases. Too much hassle with bringing module.h everywhere */
 #define fops_get(fops) \
 	(((fops) && try_module_get((fops)->owner) ? (fops) : NULL))
-- 
1.7.0.1

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/