fs: jffs2: add initial support for reading jffs2 ...

Import the jffs2 filesystem code from Linux v5.5-rc1 and convert it
to work with barebox.

Writing is *not* supported.

Testing was done with a n25q256a-compatible QuadSPI chip on a
SoCFPGA-based Socrates board.

Testing was done with a combination of:
	user@somelinuxhost: mkfs.jffs2 --eraseblock=4 -d fs/jffs2/ -o jffs2.img
	root@target:~ flash_erase -j /dev/mtd5 0 0
	root@target:~ dd if=jffs2.img of=/dev/mtd5
	barebox@EBV SOCrates:/ mount /dev/mtd0.data
	(...)
	mounted /dev/mtd0.data on /mnt/mtd0.data

Signed-off-by: Steffen Trumtrar <s.trumtrar@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

fs: Add a driver to access U-Boot environment variables ...

Add a driver working on top of ubootvar device and exposing U-Boot
environment variable data as files.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Cory Tusar <cory.tusar@zii.aero>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

treewide: surround Kconfig file paths with double quotes ...

Based on Linux commit 8636a1f

This will be needed when you sync Kconfig with Linux 5.0 or later.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

fs: cramfs: Switch to dentry cache implementation ...

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

fs: tftp: Switch to dentry cache implementation ...

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

fs: nfs: Switch to dentry cache implementation ...

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

fs: devfs: Switch to dentry cache implementation ...

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

fs: ramfs: Switch to dentry cache implementation ...

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

fs: dentry cache implementation ...

This adds the Linux dentry cache implementation to barebox.

Until now every filesystem driver resolves the full path to a file for
itself. This leads to code duplication and is error prone since
resolving paths is a complicated task. Also it can narrow down the
lookup performance since barebox only knows ASCII paths and has no way
of caching lookups.

With this patch we get the Linux dcache implementation. The path
resolving code from fs/namei.c is nearly taken as-is, minus the RCU
and locking code. Dcaching is made simple as of now: We simply cache
everything and never release any dentries. Although we do reference
counting for inodes and dentries it is effectively not used yet.
We never free anything until a fs is unmounted in which case we free
everything no matter if references are taken or not.

This patch also contains a wrapper in fs/legacy.c to support
filesystems with the old API.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ratp: allow building without full console support ...

Make CONFIG_RATP a selectable config option, so that the user can
enable RATP support without explicitly needing to enable the full
console support over RATP (e.g. only for RATP FS or built-in command
support).

The full console can still be explicitly enabled with
CONFIG_CONSOLE_RATP.

Signed-off-by: Aleksander Morgado <aleksander@aleksander.es>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

efi: move x86 efi boot support to x86 arch ...

prepare to drop the efi arch as efi boot up is not arch sepecific

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

fs: add support for SquashFS 4.0 ...

The driver was imported from Linux 4.4.

Current implementation supports only XZ decompressor.

Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>
Tested-by: Antony Pavlov <antonynpavlov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Merge branch 'for-next/ratp'

fs: Add RATP fs support ...

This adds file transfer support over RATP. The host can export a
directory using the bbremote tool which can then be mounted under
barebox as a filesystem.

Signed-off-by: Jan Luebbe <jlu@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Tested-by: Andrey Smirnov <andrew.smirnov@gmail.com>

fs: Add pstore filesystem ...

pstore is a persistent storage filesystem used for RAMOOPS. It is used
to store console logs, panics, ftrace and other information in case of a
crash/panic/oops/reboot.

pstore is implemented for barebox as a read-only filesystem at the
moment. It may be extended later on. The idea is to provide a way to
extract essential data from the last running kernel.

Most of the code is copied from the kernel. However this is only a
lightweight implementation without real write support yet.

Signed-off-by: Markus Pargmann <mpa@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ARM: Add support for semihosting ...

Add semihosting API implementation and implement a filesystem driver
to access debugging host filesystem using it.

Tested on Freescale SabreSD board (i.MX6Q) using OpenOCD

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Merge branch 'for-next/randconfig-1'

fs: bpkfs: select CRC32 ...

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

fs: uImagefs: select crc32 ...

It needs it.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

fs: implement EFI variable filesystem driver ...

This implements a filesystem for accessing EFI variables.
It is compatible to the Linux Kernel efivarfs filesystem.
Currently the variables can only be accessed readonly.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

fs: implement EFI filesystem driver ...

This implements a filesystem driver which uses the EFI Simple File
System Protocol to provide files from EFI to barebox.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

drop CONFIG_PARTITION_NEED_MTD ...

With CONFIG_PARTITION_NEED_MTD enabled we use mtd rather than devfs
directly to create partitions on mtd devices. Since:

| commit b32cd8d
| Author: Sascha Hauer <s.hauer@pengutronix.de>
| Date:   Wed Apr 9 15:49:32 2014 +0200
|
|     mtd: nand: bb: use mtd api directly
|
|     The devfs layer just adds an addition indirection between mtd
|     and the bb devices with no purpose. Drop it.
|
|     Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

The bad block aware device creation doesn't work if this option
is disabled. With this we remove CONFIG_PARTITION_NEED_MTD and always
use mtd partitions on mtd devices.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Merge branch 'for-next/fs' ...

Conflicts:
	fs/Kconfig
	fs/Makefile

fs: add BPKFS support ...

Simple update file format developed for Somfy, tools and library are
available under LGPLv2 (https://www.gitorious.org/libbpk).

This format in the v1.0 allow you to store 6 types a binary stream for
a unique hardware id:
 - bootloader
 - bootloader_version
 - description.gz
 - kernel
 - rootfs
 - firmware_version

and you can easly add more binary stream type.

The fs will display you in a directory per hw id

and if a binary stream type is unknown will be display
as unknown_%08x

 # mount image.bpk /tmp
 # ls -l /tmp/hw_id_0/
-rwxrwxrwx         10 firmware_version
-rwxrwxrwx          8 firmware_version.crc
-rwxrwxrwx    1845968 kernel
-rwxrwxrwx          8 kernel.crc
-rwxrwxrwx    5062656 rootfs
-rwxrwxrwx          8 rootfs.crc
-rwxrwxrwx        248 bootloader
-rwxrwxrwx          8 bootloader.crc
-rwxrwxrwx     248925 description.gz
-rwxrwxrwx          8 description.gz.crc
-rwxrwxrwx          4 bootloader_version
-rwxrwxrwx          8 bootloader_version.crc
-rwxrwxrwx          4 unknown_1234567g
-rwxrwxrwx          8 unknown_1234567g.crc

Why BPK and not CPIO or uImage

1) CPIO

cpio does not handle > 4GiB image and does not have any crc checksum

2) uImage

uImage only provide one crc32 for the all data part and only a list of binary
stream with no information about what is what (in multi-image format)

3) BPK

BPK provide a crc32 for the header part and one crc32 per binary stream
so if you does not care of some data you are not force to check them

And you known exactly the binary stream type and for which hw to
use it.

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Fargier Sylvain <sylvain.fargier@somfy.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

fs: add uimagefs ...

this will provide the image data and information via file

 # ls -l /tmp/
-rwxrwxrwx          3 arch
-rwxrwxrwx         12 compression
-rwxrwxrwx         16 name
-rwxrwxrwx          5 os
-rwxrwxrwx         24 time
-rwxrwxrwx         12 type
-rwxrwxrwx         10 load_addr
-rwxrwxrwx         10 entry_point
-rwxrwxrwx    2199875 data0
-rwxrwxrwx    2199875 data
-rwxrwxrwx         10 data.crc

if it's multi image

 # ls -l /tmp-multi/
-rwxrwxrwx          3 arch
-rwxrwxrwx         12 compression
-rwxrwxrwx         16 name
-rwxrwxrwx          5 os
-rwxrwxrwx         24 time
-rwxrwxrwx         16 type
-rwxrwxrwx         10 load_addr
-rwxrwxrwx         10 entry_point
-rwxrwxrwx       1292 data0
-rwxrwxrwx        983 data1
-rwxrwxrwx       2287 data
-rwxrwxrwx         10 data.crc

you can get the image header via an ioctl on any file
UIMAGEFS_METADATA

if you want to check the crc do

 # crc32 -f /tmp-multi/data -V /tmp-multi/data.crc
CRC32 for /tmp-multi/data 0x00000000 ... 0x000008ee ==> 0x88d5a0db

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

fs: Add ubifs support ...

This adds ubifs support from u-boot-2013.07. This is taken
mostly as-is, only the necessary adjustments to attach to the
barebox fs layer have been made.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Merge branch 'kconfig'

Cleanup Kconfig files ...

This patch provides a global cleanup barebox Kconfig files. This includes
replacing spaces to tabs, formatting in accordance format, removing
extraneous lines and spaces. No functional changes.

Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

fs: implement initial ext4 support from U-Boot ...

The ext4 implementation has been taken from U-Boot with some
changes:

- No global variables to allow for multiple filesystems to
  be mounted and multiple files to be open.
- remove fs internal link following and use the barebox link
  implementation.
- remove write support. This is incomplete in U-Boot, so I decided
  to skip this for now.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

omap4: add filesystem support over usb boot ...

Signed-off-by: Vicente <vicencb@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>