linux-kernel - [PATCH review 30/85] gfs2: Introduce qd2index

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Date:	Wed, 13 Feb 2013 09:51:19 -0800
From:	"Eric W. Biederman" <ebiederm@...ssion.com>
To:	<linux-fsdevel@...r.kernel.org>
Cc:	Linux Containers <containers@...ts.linux-foundation.org>,
	<linux-kernel@...r.kernel.org>,
	"Serge E. Hallyn" <serge@...lyn.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Steven Whitehouse <swhiteho@...hat.com>
Subject: [PATCH review 30/85] gfs2: Introduce qd2index

From: "Eric W. Biederman" <ebiederm@...ssion.com>

Both qd_alloc and qd2offset perform the exact same computation
to get an index from a gfs2_quota_data.   Make life a little
simpler and factor out this index computation.

Cc: Steven Whitehouse <swhiteho@...hat.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@...ssion.com>
---
 fs/gfs2/quota.c |   10 ++++++++--
 1 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/fs/gfs2/quota.c b/fs/gfs2/quota.c
index f8279ee..0e7c982 100644
--- a/fs/gfs2/quota.c
+++ b/fs/gfs2/quota.c
@@ -120,11 +120,17 @@ out:
 	return (atomic_read(&qd_lru_count) * sysctl_vfs_cache_pressure) / 100;
 }
 
+static u64 qd2index(struct gfs2_quota_data *qd)
+{
+	return (2 * (u64)qd->qd_id) +
+		test_bit(QDF_USER, &qd->qd_flags) ? 0 : 1;
+}
+
 static u64 qd2offset(struct gfs2_quota_data *qd)
 {
 	u64 offset;
 
-	offset = 2 * (u64)qd->qd_id + !test_bit(QDF_USER, &qd->qd_flags);
+	offset = qd2index(qd);
 	offset *= sizeof(struct gfs2_quota);
 
 	return offset;
@@ -147,7 +153,7 @@ static int qd_alloc(struct gfs2_sbd *sdp, int user, u32 id,
 	qd->qd_slot = -1;
 	INIT_LIST_HEAD(&qd->qd_reclaim);
 
-	error = gfs2_glock_get(sdp, 2 * (u64)id + !user,
+	error = gfs2_glock_get(sdp, qd2index(qd),
 			      &gfs2_quota_glops, CREATE, &qd->qd_gl);
 	if (error)
 		goto fail;
-- 
1.7.5.4

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