genode/repos/os/src/server/vfs
Norman Feske 9b7915facb vfs server: redesigned internal control flow
This patch reworks the VFS server to become easier to understand.

- The packet-stream handling is hidden from the node types.

- Introduced the notion of a "job" as an abstraction from the raw packet
  stream.

- The processing of requests is split into three phases:
  (1) accepting new jobs,
  (2) the execution of jobs, and
  (3) the delivery of acknowledgements.

- There is no longer a global fifo of pending nodes. Instead, each
  session has a fifo of "active" nodes, which are nodes that wait
  for the completion of jobs.

- The Io_node type no longer uses virtual functions as hooks for
  the derrived classes. Instead, it provides a number of utility
  functions.

- The control flow of the 'Io_progress_handler' is now the same as
  for the session-local packet-stream handler.

- Removed dependency from 'file_system/node.h', which is a relic
  from the ram_fs.

While reworking the code, the following semantic changes were made
additionally.

- The handling of SEEK_TAIL no longer overwrites the file content at the
  end of the file.

- Removed diagnostic message at session-creation time.

- Write loop for continuous files

Issue #3547
Issue #2303
2019-11-19 14:54:13 +01:00
..
assert.h VFS: nonblocking interface 2017-08-28 16:49:38 +02:00
main.cc vfs server: redesigned internal control flow 2019-11-19 14:54:13 +01:00
node.h vfs server: redesigned internal control flow 2019-11-19 14:54:13 +01:00
target.mk server/vfs: use Id_space to manage open nodes 2017-02-07 11:12:21 +01:00