fs: automount: Make automountpoints persistent ...

Do not remove the automountpoints when they are mounted. This way
they can be reused when they have been unmounted.

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

fs: pass path directly to cdev_open ...

Now that cdev_open handles a path we no longer have to add /dev/ to
the name.

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

filetype: Use cdev_open ...

a cdev has to be opened before usage. Use cdev_open instead of
cdev_by_name.

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

fs: Fix filesystem detection with full path ...

When mount is given a full path (including /dev/) to the cdev file
we can no longer automatically detect the filesystem. This is broken
since:

e89f1a1 detect_fs: use device instead of file

Fix it by dropping the /dev/ component of the path.

Signed-off-by: Peter Mamonov <pmamonov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

detect_fs: use device instead of file ...

detect_fs would usually mount a device on a directory,
so, use a device-specific type detection.

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

fs: Add device parameter for Linux root= option ...

When registering a filesystem device add a device parameter suitable
for the Linux root= option to boot from exactly this filesystem. Currently
the fs layer sets this parameter to the root=PARTUUID= mechanism if a
partuuid is available. Other filesystems like NFS and UBIFS which do
not have a PARTUUID can overwrite this.

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

Merge branch 'for-next/misc'

fs: Add O_RWSIZE_8 ...

To support native 64bit accesses in memcpy_sz.

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

mem: Fix memcpy_sz variable types ...

- Drop usage of 'ulong', use unsigned long
- remove unnecessary intermediate casting to unsigned long
- Use proper u8/u16/u32 types. Fixes 64bit systems on which ulong is 64bit

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

fs: make "offset" parameter of erase() and protect() 64 bit safe ...

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

fs: implement fstat ...

fstat is useful to get information about an already opened file. Add
it to barebox.

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

fs: Store the path in struct filep ...

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

fs: do not lookup global FILE * when the file is already available ...

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

fs: store pointer to fsdev instead of dev in struct filep ...

The struct device_d * in struct filep is never of interest, instead
it is always converted to a struct fs_device_d *, so simplify the code
by storing the struct fs_device_d * directly.

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

move file helper functions to separate file ...

We have our file helper functions in several places. Move them
all to lib/libfile.c.
With this we no longer have file helpers in fs/fs.c which contains
the core fs functions and no functions in lib/libbb.c which are
not from busybox.

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

automount: check for recursive automount ...

automount_mount calls run_command which may trigger an automount
again. This results in an endless loop. A simple way to trigger
this is:

mkdir /x; automount /x false; cd /x; something

Use a static variable to detect if we are currently in automount_mount()
and bail out if we are.

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

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

Conflicts:
	defaultenv/defaultenv-2-base/bin/ifup

run_command: remove unused flag parameter ...

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

read_file: Use read_full ...

At least NFS does not fulfill read requests > 1024 bytes at once.
Use read_full in read_file as read doesn't guarantee that the
whole request can be read at once.

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

mount: support filesystem options passed via -o ...

Similar to mount(8) the barebox command mount now supports passing a string
to the file system driver via -o.

This is used in the next commit to let the user specify port numbers for
nfs mounts.

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

Fix endless loop in automount code ...

A chdir to a path registered as an automount path followed by a 'ls'
results in an endless loop. This happens because the command the
automounter executes results in another automount request.
Fix this by running the automounter from the chdir code before
the cwd is actually changed.

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

fs: Add function to get cdev by mountpath ...

This is useful to know for the bootloader spec implementation.

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

fs: ignore O_TRUNC open flag for devices ...

The O_TRUNC flag has to be ignored when opening devices. Otherwise
cp /somefile /dev/somedev fails. This is broken since:

| commit d4f5bb1
| Author: Sascha Hauer <s.hauer@pengutronix.de>
| Date:   Sat Sep 28 13:12:50 2013 +0200
|
|     copy_file: Add missing O_TRUNC
|
|     Without it, when copying a smaller file over a larger file the
|     resulting file still has the remaining space from the larger file.
|
|     Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

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

fs: add cdev mount helpers ...

Introduce helpers to iterate over cdevs and mount them to a known
path.

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

fs: use bus_for_each_driver ...

Instead of using for_each_driver and testing for the bus type.

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

fs: cleanup backingstore handling ...

All filesystem drivers which need a backingstore device do the same
ignoring of '/dev/' in the backingstore followed by a cdev_open. Add a
helper function for it and let the core handle the cdev. As a side
effect this makes sure that fsdev->cdev is also set when a device is
mounted without the leading '/dev/' which was previously ignored
by the mount code.

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

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>