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  1. 17 Oct, 2008 18 commits
    • Eric Van Hensbergen's avatar
      9p: add new protocol support code · ace51c4d
      Eric Van Hensbergen authored 
      This adds a new protocol processing support code based on Anthony Liguori's
9p library code.  This code performs protocol marshalling/unmarshalling using
printf like strings to represent protocol elements.  It is my intent to use
them to replace the current functions in conv.c as well as the 
p9_create_* functions.

This should make the client implementation much more clear, and also make it
much easier to add new protocol extensions by limiting the number of places
in which changes need to be made.
Signed-off-by: default avatarEric Van Hensbergen <ericvh@gmail.com>
      ace51c4d
    • Eric Van Hensbergen's avatar
      9p: encapsulate version function · 6936bf60
      Eric Van Hensbergen authored 
      Alsmot all 9P client wire functions have their own (set of) functions.
Tversion is an exception as its encapsulated into the client_create code.

This patch moves the protocol specifics of this to a function to match the
rest of the code.
Signed-off-by: default avatarEric Van Hensbergen <ericvh@gmail.com>
      6936bf60
    • Eric Van Hensbergen's avatar
      9p: move dirread to fs layer · 06b55b46
      Eric Van Hensbergen authored 
      Currently reading a directory is implemented in the client code.
This function is not actually a wire operation, but a meta operation 
which calls read operations and processes the results.

This patch moves this functionality to the fs layer and calls component
wire operations instead of constructing their packets.  This provides a 
cleaner separation and will help when we reorganize the client functions
and protocol processing methods.
Signed-off-by: default avatarEric Van Hensbergen <ericvh@gmail.com>
      06b55b46
    • Eric Van Hensbergen's avatar
      9p: adjust 9p vfs write operation · dfb0ec2e
      Eric Van Hensbergen authored 
      Currently, the 9p net wire operation ensures that all data is sent by sending
multiple packets if the data requested is larger than the msize.  This is
better handled in the vfs code so that we can simplify wire operations to 
being concerned with only putting data onto and taking data off of the wire.
Signed-off-by: default avatarEric Van Hensbergen <ericvh@gmail.com>
      dfb0ec2e
    • Eric Van Hensbergen's avatar
      9p: move readn meta-function from client to fs layer · fbedadc1
      Eric Van Hensbergen authored 
      There are a couple of methods in the client code which aren't actually
wire operations.  To keep things organized cleaner, these operations are
being moved to the fs layer.

This patch moves the readn meta-function (which executes multiple wire
reads until a buffer is full) to the fs layer.
Signed-off-by: default avatarEric Van Hensbergen <ericvh@gmail.com>
      fbedadc1
    • Eric Van Hensbergen's avatar
      9p: consolidate read/write functions · 0fc9655e
      Eric Van Hensbergen authored 
      Currently there are two separate versions of read and write.  One for
dealing with user buffers and the other for dealing with kernel buffers.
There is a tremendous amount of code duplication in the otherwise
identical versions of these functions.  This patch adds an additional
user buffer parameter to read and write and conditionalizes handling of
the buffer on whether the kernel buffer or the user buffer is populated.
Signed-off-by: default avatarEric Van Hensbergen <ericvh@gmail.com>
      0fc9655e
    • Tejun Heo's avatar
      9p: drop broken unused error path from p9_conn_create() · 95820a36
      Tejun Heo authored 
      Post p9_fd_poll() error path which checks m->poll_waddr[i] for PTR_ERR
value has the following problems.

* It's completely unused.  Error value is set iff NULL @wait_address
  has been specified to p9_pollwait() which is guaranteed not to
  happen.

* It dereferences @m after deallocating it (introduced by 571ffeaf and
  spotted by Raja R Harinath.

* It returned the wrong value on error.  It should return
  poll_waddr[i] but it returnes poll_waddr (introduced by 571ffeaf).

* p9_mux_poll_stop() doesn't handle PTR_ERR value.  It will try to
  operate on the PTR_ERR value as if it's a normal pointer and cause
  oops.

As the error path is bogus in the first place, there's no reason to
hold onto it.  Kill it.
Signed-off-by: default avatarTejun Heo <tj@kernel.org>
Signed-off-by: default avatarEric Van Hensbergen <ericvh@gmail.com>
Cc: Raja R Harinath <harinath@hurrynot.org>
      95820a36
    • Eric Van Hensbergen's avatar
      9p: make rpc code common and rework flush code · 91b8534f
      Eric Van Hensbergen authored 
      This code moves the rpc function to the common client base,
reorganizes the flush code to be more simple and stable, and
makes the necessary adjustments to the underlying transports
to adapt to the new structure.

This reduces the overall amount of code duplication between the
transports and should make adding new transports more straightforward.
Signed-off-by: default avatarEric Van Hensbergen <ericvh@gmail.com>
      91b8534f
    • Eric Van Hensbergen's avatar
      9p: use the rcall structure passed in the request in trans_fd read_work · 1b0a763b
      Eric Van Hensbergen authored 
      This patch reworks the read_work function to enable it to directly use a passed
in rcall structure.  This should help allow us to remove unnecessary copies
in the future.
Signed-off-by: default avatarEric Van Hensbergen <ericvh@gmail.com>
      1b0a763b
    • Eric Van Hensbergen's avatar
      9p: apply common request code to trans_fd · 673d62cd
      Eric Van Hensbergen authored 
      Apply the now common p9_req_t structure to the fd transport.
Signed-off-by: default avatarEric Van Hensbergen <ericvh@gmail.com>
      673d62cd
    • Eric Van Hensbergen's avatar
      9p: apply common tagpool handling to trans_fd · ff683452
      Eric Van Hensbergen authored 
      Simplify trans_fd by using new common client tagpool structure.
Signed-off-by: default avatarEric Van Hensbergen <ericvh@gmail.com>
      ff683452
    • Eric Van Hensbergen's avatar
      9p: move request management to client code · fea511a6
      Eric Van Hensbergen authored 
      The virtio transport uses a simplified request management system
that I want to use for all transports.  This patch adapts and moves the
exisiting code for managing requests to the client common code.
Later patches will apply these mechanisms to the other transports.
Signed-off-by: default avatarEric Van Hensbergen <ericvh@gmail.com>
      fea511a6
    • Eric Van Hensbergen's avatar
      9p: eliminate callback complexity · 044c7768
      Eric Van Hensbergen authored 
      The current trans_fd rpc mechanisms use a dynamic callback mechanism which
introduces a lot of complexity which only accomodates a single special case.
This patch removes much of that complexity in favor of a simple exception
mechanism to deal with flushes.
Signed-off-by: default avatarEric Van Hensbergen <ericvh@gmail.com>
      044c7768
    • Eric Van Hensbergen's avatar
      9p: consolidate mux_rpc and request structure · 21c00368
      Eric Van Hensbergen authored 
      Currently, trans_fd has two structures (p9_req and p9_mux-rpc)
which contain mostly duplicate data.

This patch consolidates these two structures and removes p9_mux_rpc.
Signed-off-by: default avatarEric Van Hensbergen <ericvh@gmail.com>
      21c00368
    • Eric Van Hensbergen's avatar
      9p: remove unnecessary prototypes · 5503ac56
      Eric Van Hensbergen authored 
      Cleanup files by reordering functions in order to remove need for
unnecessary function prototypes.

There are no code changes here, just functions being moved around and
prototypes being eliminated.
Signed-off-by: default avatarEric Van Hensbergen <ericvh@gmail.com>
      5503ac56
    • Eric Van Hensbergen's avatar
      9p: remove duplicate client state · bead27f0
      Eric Van Hensbergen authored 
      Now that we are passing client state into the transport modules, remove
duplicate state which is present in transport private structures.
Signed-off-by: default avatarEric Van Hensbergen <ericvh@gmail.com>
      bead27f0
    • Eric Van Hensbergen's avatar
      9p: consolidate transport structure · 8b81ef58
      Eric Van Hensbergen authored 
      Right now there is a transport module structure which provides per-transport
type functions and data and a transport structure which contains per-instance
public data as well as function pointers to instance specific functions.

This patch moves public transport visible instance data to the client
structure (which in some cases had duplicate data) and consolidates the
functions into the transport module structure.
Signed-off-by: default avatarEric Van Hensbergen <ericvh@gmail.com>
      8b81ef58
    • Tejun Heo's avatar
      9p-trans_fd: use single poller · 992b3f1d
      Tejun Heo authored 
      trans_fd used pool of upto 100 pollers to monitor the r/w fds.  The
approach makes sense in userspace back when the only available
interfaces were poll(2) and select(2).  As each event monitor -
trigger - handling iteration took O(n) where `n' is the number of
watched fds, it makes sense to spread them to many pollers such that
the `n' can be divided by the number of pollers.  However, this
doesn't make any sense in kernel because persistent edge triggered
event monitoring is how the whole thing is implemented in the kernel
in the first place.

This patch converts trans_fd to use single poller which watches all
the fds instead of the poll of pollers approach.  All the fds are
registered for monitoring on creation and only the fds with pending
events are scanned when something happens much like how epoll is
implemented.

This change makes trans_fd fd monitoring more efficient and simpler.
Signed-off-by: default avatarTejun Heo <tj@kernel.org>
Signed-off-by: default avatarEric Van Hensbergen <ericvh@gmail.com>
      992b3f1d
  3. 16 Oct, 2008 22 commits