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authorMarc Eshel <eshel@almaden.ibm.com>2006-11-28 16:27:06 -0500
committerJ. Bruce Fields <bfields@citi.umich.edu>2007-05-06 20:38:50 -0400
commit1a8322b2b02071b0c7ac37a28357b93e6362f13e (patch)
tree04fbdd52d8b3c2886d70b3739b9dff683aa79f02 /fs/lockd/svcproc.c
parentf812048020282fdfa9b72a6cf539c33b6df1fd07 (diff)
downloadlwn-1a8322b2b02071b0c7ac37a28357b93e6362f13e.tar.gz
lwn-1a8322b2b02071b0c7ac37a28357b93e6362f13e.zip
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>
Diffstat (limited to 'fs/lockd/svcproc.c')
-rw-r--r--fs/lockd/svcproc.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/lockd/svcproc.c b/fs/lockd/svcproc.c
index 40b5cf496b51..9cd5c8b37593 100644
--- a/fs/lockd/svcproc.c
+++ b/fs/lockd/svcproc.c
@@ -175,6 +175,8 @@ nlmsvc_proc_lock(struct svc_rqst *rqstp, struct nlm_args *argp,
/* Now try to lock the file */
resp->status = cast_status(nlmsvc_lock(rqstp, file, &argp->lock,
argp->block, &argp->cookie));
+ if (resp->status == nlm_drop_reply)
+ return rpc_drop_reply;
dprintk("lockd: LOCK status %d\n", ntohl(resp->status));
nlm_release_host(host);