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>

diff --git a/MAINTAINERS b/MAINTAINERS
index fdc0119963e70f12c4f9e1eae3a613447e7d8781..7bcade042b0da85d696ffc3990f320f3c947887d 100644 (file)
--- 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 271a842f8c393125d517a0d91f6ca74e9a975a39..36663af56d89d47dd8cf36181e50f3b0ec75740f 100644 (file)
--- 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 a0803ac74712ec62488195415ab072de2cb23fc2..b46b0c97858161022c10d3b8f8ee167a33c6b7c0 100644 (file)
--- 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