From 19495f70d1ebcdc732dd3c94f5968a4bff198ae5 Mon Sep 17 00:00:00 2001
From: Anatolij Gustschin <agust@denx.de>
Date: Thu, 7 Jul 2011 12:25:02 +0200
Subject: [PATCH] UBIFS: fix master node recovery
When the 1st LEB was unmapped and written but 2nd LEB not,
the master node recovery doesn't succeed after power cut.
We see following error when mounting UBIFS partition on NOR
flash:
UBIFS error (pid 1137): ubifs_recover_master_node: failed to recover master node
Correct 2nd master node offset check is needed to fix the
problem. If the 2nd master node is at the end in the 2nd LEB,
first master node is used for recovery. When checking for this
condition we should check whether the master node is exactly at
the end of the LEB (without remaining empty space) or whether
it is followed by an empty space less than the master node size.
Artem: when the error happened, offs2 = 261120, sz = 512, c->leb_size = 262016.
Signed-off-by: Anatolij Gustschin <agust@denx.de>
Signed-off-by: Artem Bityutskiy <dedekind1@gmail.com>
---
fs/ubifs/recovery.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/fs/ubifs/recovery.c b/fs/ubifs/recovery.c
index 51bcf4227b299..af02790d93282 100644
--- a/fs/ubifs/recovery.c
+++ b/fs/ubifs/recovery.c
@@ -274,7 +274,8 @@ int ubifs_recover_master_node(struct ubifs_info *c)
if (cor1)
goto out_err;
mst = mst1;
- } else if (offs1 == 0 && offs2 + sz >= c->leb_size) {
+ } else if (offs1 == 0 &&
+ c->leb_size - offs2 - sz < sz) {
/* 1st LEB was unmapped and written, 2nd not */
if (cor1)
goto out_err;
--
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