linux-kernel - [PATCH 10/10] UBI: Wire-up fastmap

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Date:	Wed, 26 Sep 2012 17:51:50 +0200
From:	Richard Weinberger <richard@....at>
To:	linux-mtd@...ts.infradead.org
Cc:	linux-kernel@...r.kernel.org, tglx@...utronix.de,
	Heinz.Egger@...utronix.de, artem.bityutskiy@...ux.intel.com,
	tim.bird@...sony.com, Richard Weinberger <richard@....at>
Subject: [PATCH 10/10] UBI: Wire-up fastmap

Make fastmap known to Kconfig, UBI Makefile and MAINTAINERS.

Signed-off-by: Richard Weinberger <richard@....at>
---
 MAINTAINERS              |    6 ++++++
 drivers/mtd/ubi/Kconfig  |   20 ++++++++++++++++++++
 drivers/mtd/ubi/Makefile |    1 +
 3 files changed, 27 insertions(+), 0 deletions(-)

diff --git a/MAINTAINERS b/MAINTAINERS
index fdc0119..7bcade0 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -7075,6 +7075,12 @@ F:	drivers/mtd/ubi/
 F:	include/linux/mtd/ubi.h
 F:	include/mtd/ubi-user.h
 
+UNSORTED BLOCK IMAGES (UBI) Fastmap
+M:	Richard Weinberger <richard@....at>
+L:	linux-mtd@...ts.infradead.org
+S:	Maintained
+F:	drivers/mtd/ubi/fastmap.c
+
 USB ACM DRIVER
 M:	Oliver Neukum <oliver@...kum.org>
 L:	linux-usb@...r.kernel.org
diff --git a/drivers/mtd/ubi/Kconfig b/drivers/mtd/ubi/Kconfig
index 271a842..3620f91 100644
--- a/drivers/mtd/ubi/Kconfig
+++ b/drivers/mtd/ubi/Kconfig
@@ -56,6 +56,26 @@ config MTD_UBI_BEB_LIMIT
 
 	  Leave the default value if unsure.
 
+config MTD_UBI_FASTMAP
+	bool "UBI Fastmap (EXPERIMENTAL)"
+	depends on EXPERIMENTAL
+	default n
+	help
+	   Fastmap is a mechanism which allows attaching an UBI device
+	   in nearly constant time.
+	   Instead of scanning the whole MTD device it only has to locate
+	   a checkpoint (called fastmap) on the device.
+	   The on-flash fastmap contains all information needed to attach
+	   the device. Using fastmap makes only sense on large devices where
+	   attaching by scanning takes long. UBI will not automatically install
+	   a fastmap on old images, but you can set the UBI module parameter
+	   fm_autoconvert to 1 if you want so. Please note that fastmap-enabled
+	   images are still usable with UBI implementations without
+	   fastmap support. On typical flash devices the whole fastmap fits
+	   into one PEB. UBI will reserve PEBs to hold two fastmaps.
+
+	   If in doubt, say "N".
+
 config MTD_UBI_GLUEBI
 	tristate "MTD devices emulation driver (gluebi)"
 	help
diff --git a/drivers/mtd/ubi/Makefile b/drivers/mtd/ubi/Makefile
index a0803ac..7ab19ac 100644
--- a/drivers/mtd/ubi/Makefile
+++ b/drivers/mtd/ubi/Makefile
@@ -4,3 +4,4 @@ ubi-y += vtbl.o vmt.o upd.o build.o cdev.o kapi.o eba.o io.o wl.o attach.o
 ubi-y += misc.o debug.o
 
 obj-$(CONFIG_MTD_UBI_GLUEBI) += gluebi.o
+obj-$(CONFIG_MTD_UBI_FASTMAP) += fastmap.o
-- 
1.7.6.5

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