userlandfs: Allocate requests in-kernel as kernel-only.

Things still seem to work, and may fix some SMAP
violations.

OS: Rename B_USER_CLONEABLE_AREA to B_CLONEABLE_AREA.

It now lives in OS.h. The idea is that this will now be
accessible to userland applications, so userland memory
is protected from access by other processes, just as
kernel memory is.

No functional change (the constants are still the same,
though I've changed some to use shifts to make clear
which bits are allocated are which are unused.)

userlandfs: Read()/Write() with user_memcpy().

Change-Id: I8be72d5fb18228c0ee0394a3f906f7a50113d7ea
Reviewed-on: https://review.haiku-os.org/741
Reviewed-by: Axel Dörfler <axeld@pinc-software.de>

userlandfs: Only add kernel flags in RequestAllocator in _KERNEL_MODE.

Otherwise, create_area fails with "Invalid Argument." Should fix the
"empty directory in userlandfs mount" bug that has been appearing
since the cloneable-area fixes.

Change-Id: I26e73539a9f345e76b22a34a68fe4b49c63683c2
Reviewed-on: https://review.haiku-os.org/707
Reviewed-by: waddlesplash <waddlesplash@gmail.com>

userlandfs: Make the "request data" area user-cloneable.

Fixes #14497. Thanks to leorize for helping debug!

userlandfs: Fix 64 bit debug build.

Fix #4125: NULL device is translated to '//'

The problem appeared to be on the request creating side (i.e. in the
kernel add-on) which did not support NULL pointers properly.

Relocation of addresses in request when it is received translates
offset = 0, size = 0 to pointer NULL so that no change in that part
of code was required.

Signed-off-by: Ingo Weinhold <ingo_weinhold@gmx.de>

* Port:
- Send() now also gets the message to send as parameter.
- Added methods to reserve and unreserve space in the buffer.
* RequestAllocator: Uses the port buffer reservation methods now. This allows
to let more than one RequestAllocator use a Port in a stack-like manner.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@29565 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Removed the unused Port::SendAndReceive().
* Change Port::Receive() semantics. It does no longer use the buffer associated
with the object. Instead it allocates heap memory for the caller. Since
there's only one caller who clones the message anyway, we save one copy this
way (though we have an additional syscall in userland) and don't overwrite
a request being prepared for sending.
* Changed RequestAllocator::ReadRequest() to also read the request from the
port.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@29563 a95241bf-73f2-0310-859d-f6bbb57e9c96

Made the UserlandFS code gcc4 friendly.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@20322 a95241bf-73f2-0310-859d-f6bbb57e9c96

Copied userlandfs code from the test tree to the haiku source tree,
where it will be ported to Haiku.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@20216 a95241bf-73f2-0310-859d-f6bbb57e9c96

userlandfs: Fix 64 bit debug build.

Fix #4125: NULL device is translated to '//'

The problem appeared to be on the request creating side (i.e. in the
kernel add-on) which did not support NULL pointers properly.

Relocation of addresses in request when it is received translates
offset = 0, size = 0 to pointer NULL so that no change in that part
of code was required.

Signed-off-by: Ingo Weinhold <ingo_weinhold@gmx.de>

* Port:
- Send() now also gets the message to send as parameter.
- Added methods to reserve and unreserve space in the buffer.
* RequestAllocator: Uses the port buffer reservation methods now. This allows
to let more than one RequestAllocator use a Port in a stack-like manner.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@29565 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Removed the unused Port::SendAndReceive().
* Change Port::Receive() semantics. It does no longer use the buffer associated
with the object. Instead it allocates heap memory for the caller. Since
there's only one caller who clones the message anyway, we save one copy this
way (though we have an additional syscall in userland) and don't overwrite
a request being prepared for sending.
* Changed RequestAllocator::ReadRequest() to also read the request from the
port.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@29563 a95241bf-73f2-0310-859d-f6bbb57e9c96

Made the UserlandFS code gcc4 friendly.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@20322 a95241bf-73f2-0310-859d-f6bbb57e9c96

Copied userlandfs code from the test tree to the haiku source tree,
where it will be ported to Haiku.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@20216 a95241bf-73f2-0310-859d-f6bbb57e9c96