From: Charles Manning <cdhmanning@gmail.com>
Date: Mon, 12 Apr 2010 04:55:22 +0000 (+1200)
Subject: Add one-shot feature for yaffs auto checkpointing.
X-Git-Tag: pre-name-change~88
X-Git-Url: http://www.aleph1.co.uk/gitweb/?p=yaffs2.git;a=commitdiff_plain;h=e2652ab458ab98ccac696fe20d00013468193f78

Add one-shot feature for yaffs auto checkpointing.

This feature is enabling by ORing in 0x04 to the yaffs_auto_checkpoint
module parameter. This will do a one-shot checkpoint on the next sync and
the bit will then be reset.

This is a nice way to force a checkpoint on the next sync. eg.
echo 6 > /sys/modules/yaffs/parameters/yaffs_auto_checkpoint
sync
yaffs_auto_checkpoint will now be 2

Signed-off-by: Charles Manning <cdhmanning@gmail.com>
---

diff --git a/yaffs_fs.c b/yaffs_fs.c
index 95538ab..efaacac 100644
--- a/yaffs_fs.c
+++ b/yaffs_fs.c
@@ -1937,17 +1937,23 @@ static int yaffs_do_sync_fs(struct super_block *sb, int do_checkpoint)
 {
 
 	yaffs_Device *dev = yaffs_SuperToDevice(sb);
+	unsigned int oneshot_checkpoint = (yaffs_auto_checkpoint & 4);
+
 	T(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC, 
-		("yaffs_do_sync_fs: %s %s\n", 
+		("yaffs_do_sync_fs: %s %s%s\n",
 		sb->s_dirt ? "dirty" : "clean",
-		do_checkpoint ? "with checkpoint" : "no checkpoint"));
+		do_checkpoint ? "with checkpoint" : "no checkpoint",
+		oneshot_checkpoint ? " one-shot" : "" ));
 
-	if (sb->s_dirt) {
+	if (sb->s_dirt || oneshot_checkpoint) {
 		yaffs_GrossLock(dev);
 		yaffs_FlushSuperBlock(sb,do_checkpoint);
 		yaffs_GrossUnlock(dev);
 
 		sb->s_dirt = 0;
+
+		if(oneshot_checkpoint)
+			yaffs_auto_checkpoint &= ~4;
 	}
 	return 0;
 }