fs tftp: Fix short file transfers ...

With files smaller than the tftp block size the whole transfer is done
in tftp_do_open already. In this case we are in STATE_DONE, but there
is no error. Set priv->err to 0 and check for it to be able to transfer
small files.

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

fs: limit flash erase and protect to the partiton boundary ...

Passing a too large size or offset to erase could
affect flash outside the partition boundary.
Addresses for SPI flash wrap around, thus giving a
count + offset going past the end of the flash would
wrap around and erase flash at offset 0.

Add the same check for protect.

Signed-off-by: Johannes Stezenbach <js@sig21.net>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

devfs: don't erase past the end of the partition ...

"erase /dev/myflash0.mypart 0xf0000+0xf0000" could erase past
the end of the partition.

Signed-off-by: Johannes Stezenbach <js@sig21.net>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Merge branch 'next'

fs tftp: depend on NET, not on NET_TFTP ...

The tftp filesystem support is by no means dependent on the old tftp
support, it depends on NET though.

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

lseek: return -1 instead of -errno ...

The patch making errno a positive value has another bug:
lseek was switched to return -errno instead of -1. This does not
work since we can lseek we can address the whole 4G address space,
have of which has a negative offset when interpreted as a signed
integer. Let lseek return -1 on failure again instead.

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

fs/tftp: depend on NET_TFTP ...

else the option remains selected when network gets disabled

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

ramfs: rember last accessed chunk ...

Writing big files takes longer and longer because of the chunk list
By storing a pointer of the recent used chunk in the inode, access times are
improved.
Testet on with tftp 10M:
OMAP4 chunk size 4096: 12244ms 8192: 4239ms
	patched        2647ms        2785ms
i.MX35 chunk size 8192: 7225ms
	patched		2691ms

No impact on much smaller files seen

Signed-off-by: Jan Weitzel <j.weitzel@phytec.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

fs readdir: check for NULL pointer again ...

This got lost in:

commit 6188685
Author: Sascha Hauer <s.hauer@pengutronix.de>
Date:   Sun May 13 12:43:58 2012 +0200

    Make errno a positive value

    Normally errno contains a positive error value. A certain unnamed developer
    mixed this up while implementing U-Boot-v2. Also, normally errno is never
    set to zero by any library function.
    This patch fixes this.

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

fs: Add NFS support ...

This patch adds readonly NFS support. Currently no links are supported.
This is based on the previous U-Boot/NetBSD based code and some Kernel
bits.

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

Make errno a positive value ...

Normally errno contains a positive error value. A certain unnamed developer
mixed this up while implementing U-Boot-v2. Also, normally errno is never
set to zero by any library function.
This patch fixes this.

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

complete: add delpart complete support ...

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

Merge branch 'work/dns' into next

automount: remove existing automountpoint ...

Before creating a new mountpoint on an already existing mountpoint
we have to remove it.

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

fs tftp: use resolv to resolv ip address ...

instead of assuming the backingstore is a ip address, use resolv()
to make it possible to pass in a hostname.

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

automount: Pass automount pass as environment variable ...

This makes it possible to pass a command sequence to the automount
command instead of only a script (a command sequence would get confused
by the additional argument)

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

FAT: Fix error path ...

- forward the return value of chk_mounted to detect whether mount succeeded
- free resources on mount failure

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

fs open: pass error from stat ...

We used to simply answer with -ENOENT in open() when the
initial call to stat() failed. Instead, forward the error from
stat().

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

Add automount support ...

This patch adds an automount command which makes it possible
to execute a script when a certain directory is first accessed.
It's the commands responsibility to make this directory available
(bringing devices up and mounting it). This results in automount
support which makes sure that from the shell every file can
be accessed without having to care for device bringup. Bringing
up devices may be expensive (USB, dhcp). The automount support
makes it easy for the environment to bringup devices when they
are actually needed.

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

fs: drop struct mtab_entry ...

every struct fs_device_d contains a struct mtab_entry, so they
have a 1:1 relationship. Instead of having to use container_of
to get from a struct mtab_entry to a struct fs_device_d we can
better embed the members of struct mtab_entry into struct fs_device_d
directly.

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

fs: change get_fs_device_by_path prototype ...

get_fs_device_by_path returns a struct device_d instead of what the
name suggests a struct fs_device_d. Also it returns the rootpath
of the corresponding fs_device. This patch changes the name of
this function to get_fs_device_and_root_path to better reflect what
the function does and changes the return type to struct fs_device_d.

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

fs: get fs device using container_of ...

This reduces the usage of dev->type_data.

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

fs: get fs driver using container_of ...

This reduces the usage of dev->type_data.

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

Add suport for tftp as a filesystem ...

This adds tftp filesystem support. It currently duplicates
significant amounts of the tftp (command) support. This is ok
since we can eventually drop the original tftp command later.

tftp is not really suitable to be handled as a filesystem. It lacks
support for stat, reading directories and other things. Handling
it as a filesystem has one big advantage though: tftp is no special
case for boot scripts and/or commands anymore which makes them simpler.

This implementation has some improvements to the original tftp command.
It supports blocksize negotiation which speeds up transfers if the tftp
server supports it. Also we can determine the filesize to transfer if
the remote end supports it.

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

Merge branch 'pu/device-cleanup' into next

fs: allow to mount on subdirectories ...

Since get_mtab_entry_by_path() is a bit more flexible now
we no longer have to force the user to mount on the root
directory only. Instead, we can allow to mount on subdirectories
aswell. Nested mounts are still not possible though.

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

fs: put fs devices on its own bus ...

By putting the fs devices/drivers on a bus on its own we can hook
into the bus remove function to cleanup the fs device. This way
we can unmount a device by simply unregistering the device which
is useful for for example USB mass storage devices. These can now
unregister the assoiated filesystems by unregistering their child
devices.

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

fs: remove fs devices list ...

We store the fs devices in a list only because we want to
check if the fs driver needs a backingstore or not. The
driver will bail out anyway if it needs a backingstore and
doesn't find one. So we can remove this check and thus remove
the list of fs devices.

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

fs: remove only once used variable ...

dev is used only once, so make the code a tiny bit simpler by
not using an extra variable but dereference it when needed directly.

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

fs: simplify get_mtab_entry_by_path ...

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