linux.git/drivers/mtd/mtdpart.c, branch v4.13

mtd: partitions: fixup some allocate_partition() whitespace

2017-06-23T17:52:15+00:00

Some recent patches caused churn around this area, and checkpatch
noticed the existing issues.

Signed-off-by: Brian Norris

mtd: partitions: add support for partition parsers

2017-06-22T20:13:09+00:00

Some devices have partitions that are kind of containers with extra
subpartitions / volumes instead of e.g. a simple filesystem data. To
support such cases we need to first create normal flash device
partitions and then take care of these special ones.

It's very common case for home routers. Depending on the vendor there
are formats like TRX, Seama, TP-Link, WRGG & more. All of them are used
to embed few partitions into a single one / single firmware file.

Ideally all vendors would use some well documented / standardized format
like UBI (and some probably start doing so), but there are still
countless devices on the market using these poor vendor specific
formats.

This patch extends MTD subsystem by allowing to specify list of parsers
that should be tried for a given partition. Supporting such poor formats
is highly unlikely to be the top priority so these changes try to
minimize maintenance cost to the minimum. It reuses existing code for
these new parsers and just adds a one property and one new function.

This implementation requires setting partition parsers in a flash
parser. A proper change of bcm47xxpart will follow and in the future we
will hopefully also find a solution for doing it with ofpart
("fixed-partitions").

Signed-off-by: Rafał Miłecki 
Signed-off-by: Brian Norris

mtd: partitions: add support for subpartitions

2017-06-22T20:13:08+00:00

Some flash device partitions can be containers with extra subpartitions
(volumes). All callbacks are already capable of this additional level of
indirection.

This patch makes sure we always display subpartitions using a tree
structure and takes care of deleting subpartitions when parent gets
removed.

Signed-off-by: Rafał Miłecki 
Signed-off-by: Brian Norris

mtd: partitions: rename "master" to the "parent" where appropriate

2017-06-22T20:13:07+00:00

This prepares mtd subsystem for the new feature: subpartitions. In some
cases flash device partition can be a container with extra subpartitions
(volumes).

So far there was a flat structure implemented. One master (flash device)
could be partitioned into few partitions. Every partition got its master
and it was enough to get things running.

To support subpartitions we need to store pointer to the parent for each
partition. This is required to implement more natural tree structure and
handle all recursion and offsets calculation.

To make code consistent this patch renamed "master" to the "parent" in
places where we can be dealing with subpartitions.

Signed-off-by: Rafał Miłecki 
Signed-off-by: Brian Norris

mtd: partitions: remove sysfs files when deleting all master's partitions

2017-06-22T20:13:06+00:00

When support for sysfs "offset" file was added it missed to update the
del_mtd_partitions function. It deletes partitions just like
mtd_del_partition does so both should also take care of removing sysfs
files.

This change moves sysfs_remove_files call to the shared function to fix
this issue.

Fixes: a62c24d755291 ("mtd: part: Add sysfs variable for offset of partition")
Cc: Dan Ehrenberg 
Signed-off-by: Rafał Miłecki 
Signed-off-by: Brian Norris

mtd: partitions: add helper for deleting partition

2017-06-22T20:13:06+00:00

There are two similar functions handling deletion. One handles single
partition and another the whole MTD flash device. They share (duplicate)
some code so it makes sense to add a small helper for that part.

Function del_mtd_partitions has been moved a bit to keep all deleting
stuff together.

Signed-off-by: Rafał Miłecki 
Signed-off-by: Brian Norris

mtd: partitions: factor out code calling parser

2017-06-20T19:59:23+00:00

This code is going to be reused for parsers matched using OF so let's
factor it out to make this easier.

Signed-off-by: Brian Norris 
Signed-off-by: Rafał Miłecki 
Acked-by: Brian Norris

mtd: handle partitioning on devices with 0 erasesize

2017-06-13T17:00:55+00:00

erasesize is meaningful for flash devices but for SRAM there is no
concept of an erase block so erasesize is set to 0. When partitioning
these devices instead of ensuring partitions fall on erasesize
boundaries we ensure they fall on writesize boundaries.

Helped-by: Boris Brezillon 
Signed-off-by: Chris Packham 
Acked-by: Boris Brezillon 
Signed-off-by: Brian Norris

mtd: Add partition device node to mtd partition devices

2017-02-10T03:19:25+00:00

The user visible change here is that mtd partitions get an of_node link
in sysfs.

Signed-off-by: Sascha Hauer 
Signed-off-by: Uwe Kleine-König 
Signed-off-by: Brian Norris

mtd: introduce function max_bad_blocks

2017-02-08T21:53:52+00:00

If implemented, 'max_bad_blocks' returns the maximum number of bad
blocks to reserve for a MTD. An implementation for NAND is coming soon.

Signed-off-by: Jeff Westfahl 
Signed-off-by: Zach Brown 
Acked-by: Boris Brezillon 
Acked-by: Brian Norris 
Signed-off-by: Brian Norris