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authorJeff Layton <jlayton@redhat.com>2008-02-06 19:34:12 +0300
committerJ. Bruce Fields <bfields@citi.umich.edu>2008-02-11 02:09:36 +0300
commit9706501e43a80ce48b319214a0a9e562deded35b (patch)
tree6b2d5ec807edea5806e9dd41f1109d8e8aac160c /fs/lockd/svclock.c
parent90bd17c87821fe0e055e0f9a7446c2875f31eb4c (diff)
downloadlinux-9706501e43a80ce48b319214a0a9e562deded35b.tar.xz
NLM: don't reattempt GRANT_MSG when there is already an RPC in flight
With the current scheme in nlmsvc_grant_blocked, we can end up with more than one GRANT_MSG callback for a block in flight. Right now, we requeue the block unconditionally so that a GRANT_MSG callback is done again in 30s. If the client is unresponsive, it can take more than 30s for the call already in flight to time out. There's no benefit to having more than one GRANT_MSG RPC queued up at a time, so put it on the list with a timeout of NLM_NEVER before doing the RPC call. If the RPC call submission fails, we requeue it with a short timeout. If it works, then nlmsvc_grant_callback will end up requeueing it with a shorter timeout after it completes. Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Diffstat (limited to 'fs/lockd/svclock.c')
-rw-r--r--fs/lockd/svclock.c17
1 files changed, 13 insertions, 4 deletions
diff --git a/fs/lockd/svclock.c b/fs/lockd/svclock.c
index 2f4d8fa66689..82db7b323b83 100644
--- a/fs/lockd/svclock.c
+++ b/fs/lockd/svclock.c
@@ -763,11 +763,20 @@ callback:
dprintk("lockd: GRANTing blocked lock.\n");
block->b_granted = 1;
- /* Schedule next grant callback in 30 seconds */
- nlmsvc_insert_block(block, 30 * HZ);
+ /* keep block on the list, but don't reattempt until the RPC
+ * completes or the submission fails
+ */
+ nlmsvc_insert_block(block, NLM_NEVER);
- /* Call the client */
- nlm_async_call(block->b_call, NLMPROC_GRANTED_MSG, &nlmsvc_grant_ops);
+ /* Call the client -- use a soft RPC task since nlmsvc_retry_blocked
+ * will queue up a new one if this one times out
+ */
+ error = nlm_async_call(block->b_call, NLMPROC_GRANTED_MSG,
+ &nlmsvc_grant_ops);
+
+ /* RPC submission failed, wait a bit and retry */
+ if (error < 0)
+ nlmsvc_insert_block(block, 10 * HZ);
}
/*