Merge branch 'for-next/misc'

environment: envfs_{load, save}: add possibility to call with filename and dirname == NULL ...

This patch moves fallback to default into the envfs_{load,save} functions.

Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

environment: Do not remove base env directory ...

When removing empty directories do not remove the base
directory.

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

Add support for non volatile variables ...

This adds (back) support for non volatile variables. Non volatile
variables are variables which are stored in the environment over
reboot. They are used in the same way as the global variables, but
with a 'nv' command and device. The variables are stored under
/env/nv/, one variable per file. Adding a nv variable automatically
adds a global variable with the same name. Changing a nv variable
also changes the same global variable, but not the other way round.
This allows for example to configure the username as:

nv user=sha; saveenv

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

environment: Only save changes to the defaultenv ...

Instead of storing the complete files with a 'saveenv' command
only store the files that have changes to the default environment.

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

environment: refactor saveenv ...

Collect all files in a list first and iterate over the list
when creating the actual environment image. Makes the next
patches easier.

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

environment: remove unused variable ...

fd is unused, remove it.

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

environment: drop unnecessary casts ...

No Need to cast void pointers.

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

envfs: change API to be able to forward special flags into the envfs superblock ...

In order to be able to mark an stored envfs image with special features
(intentional ignore for example), we now can feed forward these flags.
By forwarding a '0' for the flags nothing changes because the envfs superblock
was already allocated with xzalloc.

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

envfs: provide an intentional way to ignore an existing external environment ...

Add a simple flag to envfs to be able to mark an external environment as
"not to be used".
This change should not affect existing systems, because the current envfs
implementation ensures the 'flags' member in the envfs master block is always
zeroed.

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

env: erase/protect in envfs_save ...

So that the envfs_save is more useful outside of the saveenv command

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

environment: drop envfs_register_partition ...

The purpose of envfs_register_partition is to print an error
message when the partition does not exist. Print an error message
from generic code instead and drop this function.

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

loadenv: detect truncated environment files ...

Properly detect when an environment file is truncated. This can happen
when a previous saveenv failed because the environment partition is too
small.

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

saveenv: Properly detect write errors ...

The return value check of the write call is completely bogus. We
check if we have written at minimum sizeof(struct envfs_super) bytes
instead of all bytes. Properly check for all bytes written instead
and allow write to write less bytes than requested.
Do not use write_full because this file is compiled for userspace
aswell.

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

environment: Fix unitiliazed variable ...

envfs_load_data needs a pointer to the envfs_super, otherwise it
works on an unitialized struct when detecting the envfs version.

This is broken since:

| commit 0a2a8f7
| Author: Sascha Hauer <s.hauer@pengutronix.de>
| Date:   Thu Feb 20 08:16:01 2014 +0100
|
|     environment: Add function to load envfs from buffer
|
|     Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Grmpf. Most compilers do not issue a warning, only the blackfin
gcc 4.3.5 warns about this.

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

defaultenv: Allow multiple defaultenvironment overlays ...

We can compile barebox for multiple boards at once, but currently
they all share a single default environment. This patch adds a
defaultenv_append() which boards can call to customize the default
environment during runtime. Each board now generate default environment
snippets using bbenv-y and add them during runtime with defaultenv_append()

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

environment: Add function to load envfs from buffer ...

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

environment: constify arguments ...

The directory arguments to envfs_load and envfs_save can
be const.

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

env: make path arguments to envfs_load/save const ...

These functions have no business changing the path argument, so make the
argument const.

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

environment: Use accessor functions for default environment path ...

default_environment_path only exists when CONFIG_ENV_HANDLING is enabled.
Boards would have to #ifdef this if they wanted to use
default_environment_path. Use accessor functions instead which can
be ifdeffed on a single place.

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

devfs: let devfs_add_partition return the new partition ...

Useful for unregistering later or for adding addional flags.

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

env: add register_persistent_environment ...

- heavily copied from register_persistant_environment which was
Signed-off-by: Juergen Beisert <jbe@pengutronix.de>

Signed-off-by: Eric Bénard <eric@eukrea.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Merge branch 'for-next/compile-log-level' ...

Conflicts:
	drivers/usb/host/ehci-hcd.c

treewide: fix format specifiers ...

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

make file_*_action static ...

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

move struct action_data to the only file using it ...

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

loadenv: allow more fine grained environment loading ...

This implements two new options for the loadenv command:

-s: removes (scrubs) old directory contents to be able to
    create a fresh environment from for example /dev/defaultenv
-n: no overwrite. Do not overwrite existing files. This allows
    to keep parts of the old environment.

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

Treewide: remove address of the Free Software Foundation ...

The FSF address has changed in the past. Instead of updating it
each time the address changes, just drop it completely treewide.

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

envfs: add support of symlink ...

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>

envfs: add support of variable inode size ...

Introduce a struct envfs_inode_end with more data.
Today this will just containt the file mode to be able to add the symlink
support.

But this is compatible with the previous envfs version as they will do not
care about the extra as the previous version is just reading the filename and
then consume the extra data without using them.

Increase the envfs version to 1.0

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>