read_file: Make it work on tftp servers which do not pass size ...

Some tftp servers (for example netkit-tftp) do not pass the filesize.
Add a workaround for read_file which reads the file into a temporary
file which then is copied to a buffer.

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

fs: allocate FILE table dynamically ...

Some systems are runnignfrom a very limited SRAM, but have a huge
malloc space in SDRAM. The bss normally is in SRAM, so we should
avoid having big structures there. The FILE table is 5120 bytes
big, so allocate it dynamically instead.

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

fs: add pread and pwrite functions ...

Add pread and pwrite functions.

Split read and write functions to save some space.
The functions pread and pwrite saves and sets the file
position to a given offset and restore them afterwards.

This also makes the nandtest command use these function
which is necessary to not break compilation for the nandtest
command.

Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

fs: fix return type of read ...

Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Add write_file function ...

write_file() will write a buffer to a file. The file is created
if necessary.

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

drivers/base: fix corrupt device tree ...

dev_add_child is a very unsafe function. If called multiple times
it allows setting the same device to different parents thus corrupting
the siblings list. This happens regularly since:

| commit c2e568d
| Author: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
| Date:   Sat Nov 3 16:11:05 2012 +0100
|
|    bus: add bus device
|
|    automatically add it as parent of any bus device if none already specified
|
|    we have now a nice output per bus

If for example a FATfs is mounted this nice output per bus often ends with:

>     `---- fat0
>     `---- 0
>          `---- 0x86f0000087020031-0x86f000410df27124: /dev/<NULL>
>          `---- sram00
>               `---- 0x00000000-0xffffffffffffffff: /dev/<NULL>
>               `---- 0x00000000-0xffffffffffffffff: /dev/<NULL>
>               unable to handle NULL pointer dereference at address 0x0000000c
> pc : [<87f08a20>]    lr : [<87f08a04>]
> sp : 86eff8c0  ip : 87f3fbde  fp : ffffffff
> r10: ffffffff  r9 : 00000000  r8 : 00000003
> r7 : 86f075b8  r6 : 00000002  r5 : ffffffec  r4 : 86f07544
> r3 : 00000000  r2 : 43f900b4  r1 : 00000020  r0 : 00000005
> Flags: Nzcv  IRQs off  FIQs off  Mode SVC_32
> [<87f08a20>] (do_devinfo_subtree+0x90/0x130) from [<87f08a90>] (do_devinfo_subtree+0x100/0x130)
>
> [<87f3e070>] (unwind_backtrace+0x0/0x90) from [<87f28514>] (panic+0x28/0x3c)
> [<87f28514>] (panic+0x28/0x3c) from [<87f3e4b8>] (do_exception+0x10/0x14)
> [<87f3e4b8>] (do_exception+0x10/0x14) from [<87f3e544>] (do_data_abort+0x2c/0x38)
> [<87f3e544>] (do_data_abort+0x2c/0x38) from [<87f3e268>] (data_abort+0x48/0x60)

This patch fixes this by adding a device to its parents children list in
register_device so that dev_add_child is no longer needed. This function
is removed from the tree. Now callers of register_device have to clearly
set the parent *before* registering a device.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Reported-by: Jan Lübbe <jlu@pengutronix.de>

fs: move dev_add_child before device_register ...

Biology tells us that the parent is known before the child is born.

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

fs: improve robustness ...

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

Merge branch 'for-next/remove-fsf-address' ...

Conflicts:
	drivers/net/miidev.c
	include/miidev.h

Merge branch 'for-next/driver'

driver: register bus ...

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

fs: fs.c fix cast ...

Fix casting on min argument, to avoid warnings on 64bit build.

Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Merge branch 'for-next/link'

fs: introduce get_mounted_path to get the path where a file is mounted ...

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

fs: open: add symlink support ...

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

fs: implement stat ...

stat() stats the file pointed to by path and fills in buf.

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

fs: add symlink support ...

Limit it's support to existing file only

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

fs: rename stat to lstat as we implement lstat ...

For compatibility put a inline on lstat for stat until we have the symlink
support.

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

fs: fix rmdir with symlink ...

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

fs: add readlink support ...

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

fs/mount: add autodetection type support ...

if NULL is pass as type mount will try to autodetect the filesystem type

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

fs: fix standard zero, full devices ...

The standard devices are currently broken since they have
the size ~0. As now files use loff_t as file size which is a signed
type the read implementation gets confused and now returns -1.

The current implementation also has the (somewhat theorical) problem
that we do not have real streaming devices, so /dev/zero went out
of zeroes after reading 4GB (or now LLONG_MAX).

This patch introduces a new cdev flag DEVFS_IS_CHARACTER_DEV and a new
file size flag FILE_SIZE_STREAM which makes it possible to create
real stream devices instead.

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

Merge branch 'for-next/resource-size' ...

Conflicts:
	drivers/base/resource.c
	fs/fs.c

Merge branch 'for-next/fs'

resource: store 'end' instead of 'size' in struct resource ...

Storing the size instead of the resource end in struct resource was
a mistake. 'size' ranges from 0 to UINT[32|64]_MAX + 1 which obviously
leads to problems. 'end' on the other hand will never exceed
UINT[32|64]_MAX. Also this way we can express a iomem region covering
the whole address space.

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

fs: Fix file create bug when parent is not a directory ...

When creating a file or a directory we have to check if the parent
is actually a directory. Otherwise trying it results in a crash.

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

make cdev 64bit capable ...

Next step to 64bit support: Make cdev size a 64bit type.

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

use loff_t for file offsets ...

This is a first step for 64bit file support: Make the file sizes/offsets
64bit.

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>