genode

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History

Norman Feske bdf47785b8 vfs: remove 'file_size' from read/write interfaces The 'file_size' type denotes the size of files on disk in bytes. On 32-bit architectures it is larger than the size_t, which refers to in-memory object sizes. Whereas the use of 'file_size' is appropriate for ftruncate and seek, it is not a suitable type for the parameters of read/write operations because those operations refer to in-memory buffers. This patch replaces the use of 'file_size' by size_t. However, since it affects all sites where the read/write interface is uses, it takes the opportunity to replace the C-style (pointer, size) arguments by 'Byte_range_ptr' and 'Const_byte_range_ptr'. Issue #4706		2023-02-27 08:22:49 +01:00
..
lib	dde_rump: increase max I/O request size to 1 MiB	2022-09-21 12:19:09 +02:00
patches	dde_rump: move periodic sync into rump kernel thread	2022-04-13 09:29:06 +02:00
ports	dde_rump: move periodic sync into rump kernel thread	2022-04-13 09:29:06 +02:00
recipes	depot: update recipe hashes	2023-01-24 12:07:33 +01:00
run	dde_rump: increase max I/O request size to 1 MiB	2022-09-21 12:19:09 +02:00
src	vfs: remove 'file_size' from read/write interfaces	2023-02-27 08:22:49 +01:00
README	rump_fs: support the access of GEMDOS file systems	2019-08-21 12:37:00 +02:00
rump.list	rump: reduce size of rump	2017-11-30 11:23:19 +01:00

README

                             ================================
                             Genode's Rump Kernel kernel port
                             ================================

This repository contains the Genode version of the
[http://wiki.netbsd.org/rumpkernel/ - rump kernel].
The kernel is currently used to gain file-system access from within Genode.
In order to achieve that, the rump kernel is integrated into a VFS plugin,
located at _src/lib/vfs/rump_. It can thereby by used directly by libc
applications, or indirectly by using the VFS-server component.


Building instructions
#####################

In order to build the VFS plugin, issue

! ./tool/ports/prepare_port dde_rump

from Genode's toplevel directory.


Add

! REPOSITORIES += $(GENODE_DIR)/repos/dde_rump

to your _etc/build.conf_ file of you build directory.

Finally,

! make lib/vfs/rump

called from your build directory will build the plugin.


Configuration
#############

Here is an example snippet that configures the VFS plugin:

| <rump fs="msdos" ram="7M" writeable="yes"/>"

The VFS plugin obtains a block session. If there is more than one block
session in the system, the block session must be routed to the right
block-session server. The value of the _fs_ attribute can be one of the
following: _ext2fs_ for EXT2, _cd9660_ for ISO-9660, or _msdos_ for FAT
file-system support. When accessing a _msdos_ file system, the optional
attribute 'gemdos="yes"' can be specified to operate in GEMDOS compatibility
mode.

The VFS plugin hands over the specified amount of RAM quota to the rump
kernel. The larger the quota is, the larger the internal block caches of the
rump kernel will be.