linux-kernel - [PATCH] UBIFS: always read hashed-key nodes under TNC mutex

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Message-Id: <1220194366-12731-3-git-send-email-dedekind@infradead.org>
Date:	Sun, 31 Aug 2008 17:52:36 +0300
From:	Artem Bityutskiy <dedekind@...radead.org>
To:	linux-fsdevel-owner@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	Adrian Hunter <ext-adrian.hunter@...ia.com>
Subject: [PATCH] UBIFS: always read hashed-key nodes under TNC mutex

From: Adrian Hunter <ext-adrian.hunter@...ia.com>

Leaf-nodes that have a hashed key are stored in the
leaf-node-cache (LNC) which is protected by the TNC
mutex.  Consequently, when reading a leaf node with
a hashed key (i.e. directory entries, xattr entries)
the TNC mutex is always required.

Signed-off-by: Adrian Hunter <ext-adrian.hunter@...ia.com>
---
 fs/ubifs/tnc.c |    7 +------
 1 files changed, 1 insertions(+), 6 deletions(-)

diff --git a/fs/ubifs/tnc.c b/fs/ubifs/tnc.c
index e909f4a..4fbc592 100644
--- a/fs/ubifs/tnc.c
+++ b/fs/ubifs/tnc.c
@@ -1498,7 +1498,6 @@ static int do_lookup_nm(struct ubifs_info *c, const union ubifs_key *key,
 {
 	int found, n, err;
 	struct ubifs_znode *znode;
-	struct ubifs_zbranch zbr;
 
 	dbg_tnc("name '%.*s' key %s", nm->len, nm->name, DBGKEY(key));
 	mutex_lock(&c->tnc_mutex);
@@ -1522,11 +1521,7 @@ static int do_lookup_nm(struct ubifs_info *c, const union ubifs_key *key,
 		goto out_unlock;
 	}
 
-	zbr = znode->zbranch[n];
-	mutex_unlock(&c->tnc_mutex);
-
-	err = tnc_read_node_nm(c, &zbr, node);
-	return err;
+	err = tnc_read_node_nm(c, &znode->zbranch[n], node);
 
 out_unlock:
 	mutex_unlock(&c->tnc_mutex);
-- 
1.5.4.1

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