linux-toradex.git/include/uapi/mtd/ubi-user.h, branch v3.15-rc8

UBI: make UBI_IOCVOLCRBLK take a parameter for future usage

2014-03-06T10:04:22+00:00

In order to allow a future ioctl parameter, such as a creation flag,
we change the UBI_IOCVOLCRBLK so it accepts a struct ubi_blkcreate_req.
For the time being the structure is not in use, but fully reserved.

This ABI change is still possible and harmless, because the ioctl has just
been introduced and there's no userspace program which uses it.

Signed-off-by: Ezequiel Garcia 
Signed-off-by: Artem Bityutskiy

UBI: rename block device ioctls

2014-03-05T13:49:15+00:00

Rename the UBI_IOCVOLATTBLK and UBI_IOCVOLDETBLK to UBI_IOCVOLCRBLK and
UBI_IOCVOLRMBLK, because we do not use terms "attach" and "detach" for the R/O
block devices on top of UBI volumes. Instead, we use terms "create" and
"remove". This patch also amends the related commentaries.

Signed-off-by: Artem Bityutskiy 
Acked-by: Ezequiel Garcia

UBI: R/O block driver on top of UBI volumes

2014-02-28T14:29:48+00:00

This commit introduces read-only block device emulation on top of UBI volumes.

Given UBI takes care of wear leveling and bad block management it's possible
to add a thin layer to enable block device access to UBI volumes.
This allows to use a block-oriented filesystem on a flash device.

The UBI block devices are meant to be used in conjunction with any
regular, block-oriented file system (e.g. ext4), although it's primarily
targeted at read-only file systems, such as squashfs.

Block devices are created upon user request through new ioctls:
UBI_IOCVOLATTBLK to attach and UBI_IOCVOLDETBLK to detach.
Also, a new UBI module parameter is added 'ubi.block'. This parameter is
needed in order to attach a block device on boot-up time, allowing to
mount the rootfs on a ubiblock device.
For instance, you could have these kernel parameters:

  ubi.mtd=5 ubi.block=0,0 root=/dev/ubiblock0_0

Or, if you compile ubi as a module:

  $ modprobe ubi mtd=/dev/mtd5 block=/dev/ubi0_0

Artem: amend commentaries and massage the patch a little bit.

Signed-off-by: Ezequiel Garcia 
Signed-off-by: Artem Bityutskiy

UBI: document UBI_IOCVOLUP better in user header

2013-05-29T12:19:26+00:00

The current ioctl define implies that this func expects to be passed a
64bit number directly rather than a pointer to a 64bit.  The code that
processes this ioctl shows that it clearly expects a pointer.

It'd be best if we could change the type to "__s64*", but that would
change the generated ioctl number thus breaking the userland ABI.  So
just add a comment for intrepid developers.

Signed-off-by: Mike Frysinger 
Signed-off-by: Artem Bityutskiy

UAPI: (Scripted) Disintegrate include/mtd

2012-10-09T08:49:09+00:00

Signed-off-by: David Howells 
Acked-by: Arnd Bergmann 
Acked-by: Thomas Gleixner 
Acked-by: Michael Kerrisk 
Acked-by: Paul E. McKenney 
Acked-by: Dave Jones