linux-kernel - [PATCH] writeback: __sync_single

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Message-Id: <E1JLUF5-0001rN-JM@localhost.localdomain>
Date:	Sun, 3 Feb 2008 10:05:59 +0800
From:	Fengguang Wu <wfg@...l.ustc.edu.cn>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Michael Rubin <mrubin@...gle.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [PATCH] writeback: __sync_single_inode() trivial cleanup

Make the if-else straight in __sync_single_inode().
No behavior change.

Cc: Michael Rubin <mrubin@...gle.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Signed-off-by: Fengguang Wu <wfg@...l.ustc.edu.cn>
---
 fs/fs-writeback.c |   15 +++++++--------
 1 files changed, 7 insertions(+), 8 deletions(-)

--- linux-mm.orig/fs/fs-writeback.c
+++ linux-mm/fs/fs-writeback.c
@@ -261,8 +261,13 @@ __sync_single_inode(struct inode *inode,
 	spin_lock(&inode_lock);
 	inode->i_state &= ~I_SYNC;
 	if (!(inode->i_state & I_FREEING)) {
-		if (!(inode->i_state & I_DIRTY) &&
-		    mapping_tagged(mapping, PAGECACHE_TAG_DIRTY)) {
+		if (inode->i_state & I_DIRTY) {
+			/*
+			 * Someone redirtied the inode while were writing back
+			 * the pages.
+			 */
+			redirty_tail(inode);
+		} else if (mapping_tagged(mapping, PAGECACHE_TAG_DIRTY)) {
 			/*
 			 * We didn't write back all the pages.  nfs_writepages()
 			 * sometimes bales out without doing anything. Redirty
@@ -306,12 +311,6 @@ __sync_single_inode(struct inode *inode,
 				inode->i_state |= I_DIRTY_PAGES;
 				redirty_tail(inode);
 			}
-		} else if (inode->i_state & I_DIRTY) {
-			/*
-			 * Someone redirtied the inode while were writing back
-			 * the pages.
-			 */
-			redirty_tail(inode);
 		} else if (atomic_read(&inode->i_count)) {
 			/*
 			 * The inode is clean, inuse

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