treewide: remove references to CREDITS ...

The CREDITS file was removed from barebox in 2015 by commit 6570288f2d97
("Remove the CREDITS file"). Remove references to it from several files.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

fs: devfs-core: do a case-insensitive compare of partuuids ...

partuuids are represented as hexadecimal strings, where case doesn't
matter. barebox formats them as lower case internally, forcing the
partuuid device tree property to be lower case too. Use strcasecmp to
be case-insensitive.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

fs: devfs-core: have device_find_partition search symlinks ...

The barebox,environment binding documentation notes following for
the device-path property's second string:
> <partname> can be the label for MTD partitions, the number for DOS
> partitions (beginning with 0) or the name for GPT partitions.

This doesn't work currently because the named partitions are realized as
symlinks and those aren't searched by device_find_partition.

Fix this by having symlinks feature an appropriate partname if the cdev
they link at has one and then have device_find_partition search those as
well.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

fs: Share code between mem_write()/mem_read() ...

Rename memcpy_sz() to mem_copy() and move all of the identical code
from mem_write()/mem_read() there.

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

fs: Avoid division in memcpy_sz() ...

Instead of dividing count by rwsize, use ALIGN_DOWN() and change the
loop to decrement by "rwsize" bytes.

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

devfs: Drop dev_lseek_default() ...

Only the following cdevs do not declare an .lseek() operation:

  - Console devices in common/console.c
  - Firmware framework in common/firmware.c
  - JTAG driver in drivers/misc/jtag.c
  - UBI in drivers/mtd/ubi/barebox.c

Of those four, first two are marked DEVFS_IS_CHARACTER_DEV and
implement only .write() operation and the last two don't implement
anything but .ioctl(). While there's probably no meaningful way to use
lseek() against any of those devices, there doesn't seem to be any
harm in allowing it either.

Change devfs_lseek() to ignore absense of .lseek() callback and drop
dev_lseek_default() and all references to it in the codebase.

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

fs: devfs-core: Make use of devpath_to_name() ...

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

fs: Move mem_write/mem_read to devfs-core ...

fs.c is already heavily filled with code. Move mem_write/mem_read
to devfs-core where it fits better.

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

rename file_operations -> cdev_operations ...

Linux also has struct file_operations which are something different.
Rename our file_operations to cdev_operations which better matches
what we have.

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

fs: add support loop mount offset ...

When loop mounting, allow to specify an offset into the file, similarly
to the losetup offset option. Multiplicative suffixes are supported.

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

devfs-core: add function to find cdev by partuuid ...

Signed-off-by: Steffen Trumtrar <s.trumtrar@pengutronix.de>
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>

fs: add cdev_create_loop and cdev_remove_loop for loop mount option ...

Allow to create a loopback cdev from a file.

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Fixed up with:

fs: Makefile: Add parseopt to all builds

parseopt.h was included to fs.c with commit 9248b, but parseopt.o has a
dependency to CONFIG_FS_NFS.

Moved parseopt.o to the default build to eliminate build failures.

Signed-off-by: Daniel Schultz <d.schultz@phytec.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

fs: Create automount entries for the default mount pathes ...

In barebox the default mount path for a cdev is /mnt/<cdevname>
which can be mounted with "mount <cdevname>" without specifying
a target path explicitly. Simplify this further by creating automount
entries for the default mount pathes which makes a manual mount
completely unnecessary.

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

fs: devfs-core: replace DEVFS_IS_PARTITION flag with pointer to the master cdev ...

Instead of having a flag indicating a cdev is a partition on
some master cdev, just add a master pointer to the cdev, so
that we can also find out who the master is.

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

fs: devfs-core: remove unused code ...

Partitions on mtd devices are implemented as mtd devices themselves
which have a ioctl hook. The DEVFS_IS_PARTITION flag is never set
for these devices, so the partition offset translation code in
fs/devfs-core.c is unused. Remove it.

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

cdev: Collect partitions on list ...

We currently do not have a way to iterate over all partitions of
a cdev. Change this.

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

mtd: Add support for marking blocks as good ...

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

mtd: Fix erasing of devices >4GiB ...

When a device >4GiB is erased, not only the offset can be bigger
than 4GiB, but also the size. This happens with the simplest command
to erase a device: erase /dev/nand0. Make the size argument a 64bit
type to make this work.

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

devfs: Add symlink support ...

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

cdev: When creating a new cdev, initialize device_node ...

If a new cdev doesn't have a device_node defined when passed to
devfs_create(), set it to the device_node of the parent device, if one
exists.

For non-partitions, like ocotp or eeprom devices, this is the correct
thing to do.  Partitions need to use, and do use, a different node.

The code from commit 274e0b8 to set
device_node in ocotp can be removed.

Signed-off-by: Trent Piepho <tpiepho@kymetacorp.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

fs: devfs: Allow mount path in cdev_open ...

When opening a cdev also allow a path beginning with /dev/ as some
users of cdev_open already open coded this behaviour.

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

cdev: Add function to find cdev by device_node ...

This adds a device_node member to struct cdev and a function
to find a cdev by device_node.
This also removes the setting of cdev->dev->device_node in
the of partition parser. We must not set the device since it
may not refer to a partition but to a whole device with partitions.

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>

devfs-core: return new cdev also for mtd partitions ...

__devfs_add_partition returns the newly created cdev, but in case
of mtd partitions it accidently returns 0. Fix this.

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

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

Conflicts:
	fs/devfs-core.c

devfs: partitioning: add new helper devfs_create_partitions ...

Compared to devfs_add_partition which adds a single partition
devfs_create_partitions creates several partitions at once. One nice
benefit is that this simplifies appending partitions because the start
of the latter partition doesn't need to be specified explicitly.
Also dev_add_bb_dev() is called by the new helper if the bbname is
specified for a partition.

Note that adding partitions is also more flexible now (also via
devfs_add_partition) because negative values for offset and size now
have a proper meaning instead of creating broken partitions.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

devfs_add_partition: make flags parameter unsigned ...

The value is only used to assign to a (*struct cdev)->flags which is an
unsigned int and it is passed as fourth parameter of mtd_add_partition which
is an unsigned long.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

devfs: partitioning: add missing free in error path ...

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

mtd: register mtd partitions as real mtd devices ...

So far mtd partitions were mtd devices, but these were not registered.
This patch changes this. mtd partitions are now registered like real
mtd devices. This makes them part of the device hierarchy.

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

mtd: Add subpagesize to mtd_info_user ...

ubiformat needs the subpagesize to work correctly. The kernel uses
sysfs to pass the subpagesize, but in barebox we have the possibility
to extend struct mtd_info_user. Add a corresponding field and use it
in ubiformat.

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