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authorRichard Weinberger <richard@nod.at>2012-09-26 17:51:50 +0200
committerArtem Bityutskiy <artem.bityutskiy@linux.intel.com>2012-10-03 16:39:37 +0300
commit76ac66e469f084d41742ba08923de76fbdc7dce3 (patch)
treef56c894f1315f477895617b9075e2df7fa0108c6
parentdbb7d2a88d2a7bd3624e090bee42cdee048d9290 (diff)
downloadlinux-76ac66e469f084d41742ba08923de76fbdc7dce3.tar.gz
UBI: Wire-up fastmap
Make fastmap known to Kconfig, UBI Makefile and MAINTAINERS. Signed-off-by: Richard Weinberger <richard@nod.at> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
-rw-r--r--MAINTAINERS6
-rw-r--r--drivers/mtd/ubi/Kconfig21
-rw-r--r--drivers/mtd/ubi/Makefile1
3 files changed, 28 insertions, 0 deletions
diff --git a/MAINTAINERS b/MAINTAINERS
index fdc0119963e..7bcade042b0 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@nod.at>
+L: linux-mtd@lists.infradead.org
+S: Maintained
+F: drivers/mtd/ubi/fastmap.c
+
USB ACM DRIVER
M: Oliver Neukum <oliver@neukum.org>
L: linux-usb@vger.kernel.org
diff --git a/drivers/mtd/ubi/Kconfig b/drivers/mtd/ubi/Kconfig
index 271a842f8c3..36663af56d8 100644
--- a/drivers/mtd/ubi/Kconfig
+++ b/drivers/mtd/ubi/Kconfig
@@ -56,6 +56,27 @@ config MTD_UBI_BEB_LIMIT
Leave the default value if unsure.
+config MTD_UBI_FASTMAP
+ bool "UBI Fastmap (Experimental feature)"
+ default n
+ help
+ Important: this feature is experimental so far and the on-flash
+ format for fastmap may change in the next kernel versions
+
+ 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 a0803ac7471..b46b0c97858 100644
--- a/drivers/mtd/ubi/Makefile
+++ b/drivers/mtd/ubi/Makefile
@@ -2,5 +2,6 @@ obj-$(CONFIG_MTD_UBI) += ubi.o
ubi-y += vtbl.o vmt.o upd.o build.o cdev.o kapi.o eba.o io.o wl.o attach.o
ubi-y += misc.o debug.o
+ubi-$(CONFIG_MTD_UBI_FASTMAP) += fastmap.o
obj-$(CONFIG_MTD_UBI_GLUEBI) += gluebi.o