[PATCH v3 0/1] ubi: Introduce block devices for UBI volumes

[Ezequiel Garcia]

This patch adds block device access on top of UBI volumes, which allows
for a ligthweigth solution to mount block-oriented filesystems on top of
flash devices.

If you are wondering why we want this, you can read this discussion:

  http://lkml.indiana.edu/hypermail/linux/kernel/1211.2/02556.html

In particular, it's important to note this already has users:

  http://permalink.gmane.org/gmane.linux.drivers.mtd/46221

* Changes from v2 *

On this 3rd version of the patch I've re-worked the patch considerably,
mostly integrating it with UBI, instead of making it a separate module.

Despite this integration, the ubiblock code is still completely independent
of the UBI core and it can be completely compiled-out through configuration.
In turn, making ubiblock part of UBI allows to add ioctl access to attach/detach
block devices to/from UBI volumes in a very simple way.

A new tool 'ubiblkvol' is added to ubi-utils to access these two new ioctls.

To address the 'write or not to write' discussion, the write support is enabled
with a kernel option and there's a big fat 'DANGEROUS' label on it to prevent
misusage.

I'm eager to hear some comments, and perhaps some flames: it's getting very cold
this autumn south of south-america :)

Ezequiel Garcia (1):
  ubi: Introduce block devices for UBI volumes

 drivers/mtd/ubi/Kconfig     |  24 ++
 drivers/mtd/ubi/Makefile    |   1 +
 drivers/mtd/ubi/block.c     | 894 ++++++++++++++++++++++++++++++++++++++++++++
 drivers/mtd/ubi/build.c     |   5 +
 drivers/mtd/ubi/cdev.c      |  20 +
 drivers/mtd/ubi/ubi.h       |  14 +
 include/uapi/mtd/ubi-user.h |  11 +
 7 files changed, 969 insertions(+)
 create mode 100644 drivers/mtd/ubi/block.c

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1.8.1.5