From 781d5135a61025caea65ef66b5c6bde2ef950e40 Mon Sep 17 00:00:00 2001
From: batt <batt@38d2e660-2303-0410-9eaa-f027e97ec537>
Date: Mon, 17 Dec 2007 15:49:43 +0000
Subject: [PATCH] Handle seqnum wraparound.
git-svn-id: https://src.develer.com/svnoss/bertos/trunk@1039 38d2e660-2303-0410-9eaa-f027e97ec537
---
fs/battfs.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/fs/battfs.c b/fs/battfs.c
index 752ec3c6..1b8bf923 100644
--- a/fs/battfs.c
+++ b/fs/battfs.c
@@ -339,8 +339,9 @@ bool battfs_init(struct BattFsSuper *disk)
pgcnt_t new_page, old_page;
fill_t old_fill;
- #warning fix seq wraparound!
- if (hdr.seq > hdr_old.seq)
+ /* Fancy check to handle seq wraparound */
+ #define HALF_SEQ ((1 << (sizeof(seq_t) * CPU_BITS_PER_CHAR)) / 2)
+ if ((hdr.seq - hdr_old.seq) < HALF_SEQ)
{
/* Actual header is newer than the previuos one */
old_page = disk->page_array[array_pos];
--
2.34.1