mtd/fs Kconfig,1.17,1.18

[havasi at infradead.org]

Update of /home/cvs/mtd/fs
In directory phoenix.infradead.org:/tmp/cvs-serv3759/fs

Modified Files:
	Kconfig 
Log Message:
[JFFS2] Adding erase block summary support (mount time improvement)

The goal of summary is to speed up the mount time. Erase block summary (EBS)
stores summary information at the end of every (closed) erase block. It is
no longer necessary to scan all nodes separetly (and read all pages of them)
just read this "small" summary, where every information is stored which is
needed at mount time.

This summary information is stored in a JFFS2_FEATURE_RWCOMPAT_DELETE. During
the mount process if there is no summary info the orignal scan process will 
be executed. EBS works with NAND and NOR flashes, too.

There is a user space tool called sumtool to generate this summary 
information for a JFFS2 image.



Index: Kconfig
===================================================================
RCS file: /home/cvs/mtd/fs/Kconfig,v
retrieving revision 1.17
retrieving revision 1.18
diff -u -r1.17 -r1.18
--- Kconfig	9 May 2005 08:16:08 -0000	1.17
+++ Kconfig	7 Sep 2005 08:34:52 -0000	1.18
@@ -64,6 +64,19 @@
 	    - NOR flash with transparent ECC
 	    - DataFlash
 
+config JFFS2_SUMMARY
+	bool "JFFS2 summary support (EXPERIMENTAL)"
+	depends on JFFS2_FS && EXPERIMENTAL
+	default n
+	help
+	  This feature makes it possible to use summary information
+	  for faster filesystem mount.
+
+	  The summary information can be inserted into a filesystem image
+	  by the utility 'sumtool'.
+
+	  If unsure, say 'N'.
+
 config JFFS2_COMPRESSION_OPTIONS
 	bool "Advanced compression options for JFFS2"
 	default n