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mtd: Add mtdswap block driver

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Add a driver for allowing an mtd device to be used as a block device for
swapping. The block device is volatile, and the mapping of swapped pages
is not stored on flash.

Signed-off-by: Jarkko Lavinen <jarkko.lavinen@nokia.com>
Tested-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Jarkko Lavinen 2011-02-14 16:16:11 +02:00 committed by David Woodhouse
parent 115ee88c15
commit a321590246
3 changed files with 1612 additions and 0 deletions
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18
drivers/mtd/Kconfig
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@ -325,6 +325,24 @@ config MTD_OOPS
To use, add console=ttyMTDx to the kernel command line,
where x is the MTD device number to use.
config MTD_SWAP
tristate "Swap on MTD device support"
depends on MTD && SWAP
select MTD_BLKDEVS
help
Provides volatile block device driver on top of mtd partition
suitable for swapping. The mapping of written blocks is not saved.
The driver provides wear leveling by storing erase counter into the
OOB.
config MTD_SWAP_STRICT
bool "Strict erase error handling"
depends on MTD_SWAP
help
Enables strict tolerance on failed erasures, marking erase blocks bad
right after the first failed operation. With non-strict mode the
erase operation is retried.
source "drivers/mtd/chips/Kconfig"
source "drivers/mtd/maps/Kconfig"

1
drivers/mtd/Makefile
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@ -25,6 +25,7 @@ obj-$(CONFIG_RFD_FTL) += rfd_ftl.o
obj-$(CONFIG_SSFDC) += ssfdc.o
obj-$(CONFIG_SM_FTL) += sm_ftl.o
obj-$(CONFIG_MTD_OOPS) += mtdoops.o
obj-$(CONFIG_MTD_SWAP) += mtdswap.o
nftl-objs := nftlcore.o nftlmount.o
inftl-objs := inftlcore.o inftlmount.o

1593
drivers/mtd/mtdswap.c Normal file
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