linux-kernel - [PATCH] FS-Cache: Fix operation handling

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Date:	Fri, 14 Jan 2011 16:00:47 +0000
From:	David Howells <dhowells@...hat.com>
To:	torvalds@...l.org, akpm@...ux-foundation.org
Cc:	linux-cachefs@...hat.com, linux-kernel@...r.kernel.org,
	Akshat Aranya <aranya@...-labs.com>,
	David Howells <dhowells@...hat.com>
Subject: [PATCH] FS-Cache: Fix operation handling

From: Akshat Aranya <aranya@...-labs.com>

fscache_submit_exclusive_op() adds an operation to the pending list if
other operations are pending.  Fix the check for pending ops as n_ops must be
greater than 0 at the point it is checked as it is incremented immediately
before under lock.

Signed-off-by: Akshat Aranya <aranya@...-labs.com>
Signed-off-by: David Howells <dhowells@...hat.com>
---

 fs/fscache/operation.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/fs/fscache/operation.c b/fs/fscache/operation.c
index b9f34ea..48a18f1 100644
--- a/fs/fscache/operation.c
+++ b/fs/fscache/operation.c
@@ -101,7 +101,7 @@ int fscache_submit_exclusive_op(struct fscache_object *object,
 		object->n_ops++;
 		object->n_exclusive++;	/* reads and writes must wait */
 
-		if (object->n_ops > 0) {
+		if (object->n_ops > 1) {
 			atomic_inc(&op->usage);
 			list_add_tail(&op->pend_link, &object->pending_ops);
 			fscache_stat(&fscache_n_op_pend);

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