tree 04fbdd52d8b3c2886d70b3739b9dff683aa79f02
parent f812048020282fdfa9b72a6cf539c33b6df1fd07
author Marc Eshel <eshel@almaden.ibm.com> 1164749226 -0500
committer J. Bruce Fields <bfields@citi.umich.edu> 1178498330 -0400

lockd: add code to handle deferred lock requests

Rewrite nlmsvc_lock() to use the asynchronous interface.

As with testlock, we answer nlm requests in nlmsvc_lock by first looking up
the block and then using the results we find in the block if B_QUEUED is
set, and calling vfs_lock_file() otherwise.

If this a new lock request and we get -EINPROGRESS return on a non-blocking
request then we defer the request.

Also modify nlmsvc_unlock() to call the filesystem method if appropriate.

Signed-off-by: Marc Eshel <eshel@almaden.ibm.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>