From: charles <charles>
Date: Wed, 7 Dec 2005 22:19:26 +0000 (+0000)
Subject: Hook wide tnode support into Linux
X-Git-Tag: pre-name-change~383
X-Git-Url: http://www.aleph1.co.uk/gitweb/?p=yaffs2.git;a=commitdiff_plain;h=1c37d23fde7e4f63dd764f2fa0c1f2d747ea2a01;ds=sidebyside

Hook wide tnode support into Linux
---

diff --git a/Kconfig b/Kconfig
index da516dd..7127050 100644
--- a/Kconfig
+++ b/Kconfig
@@ -58,6 +58,21 @@ config YAFFS_YAFFS2
 
 	  If unsure, say Y.
 
+config YAFFS_DISABLE_WIDE_TNODES
+	bool "Turn off wide tnodes"
+	depends on YAFFS_FS
+	default n
+	help
+	  Wide tnodes are only used for large NAND arrays (>=32MB for
+	  512-byte page devices and >=128MB for 2k page devices). They use 
+	  slightly more RAM but are faster since they eliminate chunk group
+	  searching.
+
+	  Setting this to 'y' will force tnode width to 16 bits and make
+	  large arrays slower.
+
+	  If unsure, say N.
+
 config YAFFS_DISABLE_CHUNK_ERASED_CHECK
 	bool "Turn off debug chunk erase check"
 	depends on YAFFS_FS
diff --git a/yaffs_fs.c b/yaffs_fs.c
index 02d6b82..f97455b 100644
--- a/yaffs_fs.c
+++ b/yaffs_fs.c
@@ -31,7 +31,7 @@
  */
 
 const char *yaffs_fs_c_version =
-    "$Id: yaffs_fs.c,v 1.34 2005-11-14 21:00:54 charles Exp $";
+    "$Id: yaffs_fs.c,v 1.35 2005-12-07 22:19:26 charles Exp $";
 extern const char *yaffs_guts_c_version;
 
 #include <linux/config.h>
@@ -1465,6 +1465,10 @@ static struct super_block *yaffs_internal_read_super(int yaffsVersion,
 	dev->useNANDECC = 1;
 #endif
 
+#ifdef CONFIG_YAFFS_DISABLE_WIDE_TNODES
+	dev->wideTnodesDisabled = 1;
+#endif
+
 	/* we assume this is protected by lock_kernel() in mount/umount */
 	list_add_tail(&dev->devList, &yaffs_dev_list);