From 5ea0d75037b93baa453b4d326c6319968fe91cea Mon Sep 17 00:00:00 2001 From: Marc Eshel Date: Tue, 28 Nov 2006 16:27:06 -0500 Subject: lockd: handle test_lock deferrals Rewrite nlmsvc_testlock() to use the new asynchronous interface: instead of immediately doing a posix_test_lock(), we first look for a matching block. If the subsequent test_lock returns anything other than -EINPROGRESS, we then remove the block we've found and return the results. If it returns -EINPROGRESS, then we defer the lock request. In the case where the block we find in the first step has B_QUEUED set, we bypass the vfs_test_lock entirely, instead using the block to decide how to respond: with nlm_lck_denied if B_TIMED_OUT is set. with nlm_granted if B_GOT_CALLBACK is set. by dropping if neither B_TIMED_OUT nor B_GOT_CALLBACK is set Signed-off-by: Marc Eshel Signed-off-by: J. Bruce Fields --- fs/lockd/svcproc.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'fs/lockd/svcproc.c') diff --git a/fs/lockd/svcproc.c b/fs/lockd/svcproc.c index d13b827dfd3..40b5cf496b5 100644 --- a/fs/lockd/svcproc.c +++ b/fs/lockd/svcproc.c @@ -33,6 +33,7 @@ cast_to_nlm(__be32 status, u32 vers) case nlm_lck_denied_nolocks: case nlm_lck_blocked: case nlm_lck_denied_grace_period: + case nlm_drop_reply: break; case nlm4_deadlock: status = nlm_lck_denied; @@ -128,6 +129,8 @@ nlmsvc_proc_test(struct svc_rqst *rqstp, struct nlm_args *argp, /* Now check for conflicting locks */ resp->status = cast_status(nlmsvc_testlock(rqstp, file, &argp->lock, &resp->lock, &resp->cookie)); + if (resp->status == nlm_drop_reply) + return rpc_drop_reply; dprintk("lockd: TEST status %d vers %d\n", ntohl(resp->status), rqstp->rq_vers); -- cgit v1.2.3