linux-kernel - [PATCH 2/8] fs/fscache: remove spin_lock() from the condition in while() [ver #2]

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Date:	Fri, 10 May 2013 20:33:15 +0100
From:	David Howells <dhowells@...hat.com>
To:	Trond.Myklebust@...app.com, torvalds@...ux-foundation.org
Cc:	linux-fsdevel@...r.kernel.org, linux-nfs@...r.kernel.org,
	linux-cachefs@...hat.com, linux-kernel@...r.kernel.org,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Subject: [PATCH 2/8] fs/fscache: remove spin_lock() from the condition in
 while() [ver #2]

From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>

The spinlock() within the condition in while() will cause a compile error
if it is not a function. This is not a problem on mainline but it does not
look pretty and there is no reason to do it that way.
That patch writes it a little differently and avoids the double condition.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Signed-off-by: David Howells <dhowells@...hat.com>
---

 fs/fscache/page.c |   16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/fs/fscache/page.c b/fs/fscache/page.c
index ff000e5..4882c80 100644
--- a/fs/fscache/page.c
+++ b/fs/fscache/page.c
@@ -796,11 +796,16 @@ void fscache_invalidate_writes(struct fscache_cookie *cookie)
 
 	_enter("");
 
-	while (spin_lock(&cookie->stores_lock),
-	       n = radix_tree_gang_lookup_tag(&cookie->stores, results, 0,
-					      ARRAY_SIZE(results),
-					      FSCACHE_COOKIE_PENDING_TAG),
-	       n > 0) {
+	for (;;) {
+		spin_lock(&cookie->stores_lock);
+		n = radix_tree_gang_lookup_tag(&cookie->stores, results, 0,
+					       ARRAY_SIZE(results),
+					       FSCACHE_COOKIE_PENDING_TAG);
+		if (n == 0) {
+			spin_unlock(&cookie->stores_lock);
+			break;
+		}
+
 		for (i = n - 1; i >= 0; i--) {
 			page = results[i];
 			radix_tree_delete(&cookie->stores, page->index);
@@ -812,7 +817,6 @@ void fscache_invalidate_writes(struct fscache_cookie *cookie)
 			page_cache_release(results[i]);
 	}
 
-	spin_unlock(&cookie->stores_lock);
 	_leave("");
 }
 

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