[PATCH 0/5] Extends block2mtd and ubi drivers

Pali Rohár
2017-06-02T15:43:58Z

This patch series extends block2mtd and ubi drivers to better handle
read-only devices and allow to load UBI image from local file which was
created for nand device.

Tested for Nokia N900 with Maemo 5 rootfs ubifs image
(rootfs_RX-51_2009SE_21.2011.38-1_PR_MR0) which has erase size 128k,
write size 2k and nand subpage shift 2.

$ losetup -r /dev/loop0 rootfs_RX-51_2009SE_21.2011.38-1_PR_MR0.ubifs
$ echo -n /dev/loop0,131072,2048,2 > /sys/module/block2mtd/parameters/block2mtd
$ ubiattach -p /dev/mtd0
$ mount /dev/ubi0_0 /mnt/ubi -t ubifs
...
$ umount /dev/ubi0_0
$ ubidetach -p /dev/mtd0
$ echo -n del=/dev/loop0 > /sys/module/block2mtd/parameters/block2mtd
$ losetup -d /dev/loop0

Pali Rohár (5):
mtd: block2mtd: Check for valid user supplied erase size
mtd: block2mtd: Add support for specifying MTD write size and subpage
shift
mtd: block2mtd: Fallback to read-only mode
mtd: block2mtd: Add support for deleting block2mtd mapping
ubi: Allow to use read-only UBI volume with not enough PEBs

drivers/mtd/devices/block2mtd.c | 129 ++++++++++++++++++++++++++++++---------
drivers/mtd/ubi/vtbl.c | 14 +++--
2 files changed, 110 insertions(+), 33 deletions(-)

--
1.7.9.5