From: batt <batt@38d2e660-2303-0410-9eaa-f027e97ec537>
Date: Tue, 5 Feb 2008 14:27:32 +0000 (+0000)
Subject: Handle seq wrap.
X-Git-Tag: 1.0.0~159
X-Git-Url: https://codewiz.org/gitweb?a=commitdiff_plain;h=95653ebdc7081ad0c989e971fe4cab9bc8d1f945;hp=4c1f7cd0bcf77994d03cacf2f3cbb5d529cc1ff8;p=bertos.git

Handle seq wrap.

git-svn-id: https://src.develer.com/svnoss/bertos/trunk@1093 38d2e660-2303-0410-9eaa-f027e97ec537
---

diff --git a/fs/battfs.c b/fs/battfs.c
index 8289e91d..422ce9e6 100644
--- a/fs/battfs.c
+++ b/fs/battfs.c
@@ -418,9 +418,8 @@ bool battfs_init(struct BattFsSuper *disk)
 				pgcnt_t new_page, old_page;
 				fill_t old_fill;
 
-				/* Fancy check to handle seq wraparound */
-				#define HALF_SEQ (1 << ((sizeof(seq_t) * CPU_BITS_PER_CHAR) - 1))
-				if ((hdr.seq - hdr_old.seq) < HALF_SEQ)
+				/* Fancy check to handle seq wraparound (2 bits only) */
+				if (((hdr.seq - hdr_old.seq) & 0x03) < 2)
 				{
 					/* Current header is newer than the previuos one */
 					old_page = disk->page_array[array_pos];