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authorChuck Lever <chuck.lever@oracle.com>2010-12-14 18:05:52 +0300
committerTrond Myklebust <Trond.Myklebust@netapp.com>2010-12-16 20:37:26 +0300
commit8ea6ecc8b0759756a766c05dc7c98c51ec90de37 (patch)
tree225f6f30c7f9a16b585dd38ee1b7f6b0646f990d /include/linux/lockd
parent7db836d4a427c3c64406b00b6d8d745d6335d72a (diff)
downloadlinux-8ea6ecc8b0759756a766c05dc7c98c51ec90de37.tar.xz
lockd: Create client-side nlm_host cache
NFS clients don't need the garbage collection processing that is performed on nlm_host structures. The client picks up an nlm_host at mount time and holds a reference to it until the file system is unmounted. Servers, on the other hand, don't have a precise way to tell when an nlm_host is no longer being used, so zero refcount nlm_host entries are left to expire in the cache after a time. Basically there's nothing holding a reference to an nlm_host between individual server-side NLM requests, but we can't afford the expense of recreating them for every new NLM request from a client. The nlm_host cache adds some lifetime hysteresis to entries in the cache so the next time a particular nlm_host is needed, it's likely to be discovered by a lookup rather than created from whole cloth. With the new implementation, client nlm_host cache items are no longer garbage collected, and are destroyed directly by a new release function specialized for client entries, nlmclnt_release_host(). They are cached in their own data structure, and have their own lookup logic, simplified and specialized for client nlm_host entries. However, the client nlm_host cache still shares reboot recovery logic with the server nlm_host cache. The NSM "peer rebooted" downcall for clients and servers still come through the same RPC call. This is a legacy formal API that would be difficult to alter, and besides, the user space NSM implementation can't tell the difference between peers that are clients or servers. For this reason, the client cache continues to share the nlm_host_mutex (and reboot recovery logic) with the server cache. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'include/linux/lockd')
-rw-r--r--include/linux/lockd/lockd.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/lockd/lockd.h b/include/linux/lockd/lockd.h
index a32ba62455af..6c2a0e2f298e 100644
--- a/include/linux/lockd/lockd.h
+++ b/include/linux/lockd/lockd.h
@@ -223,6 +223,7 @@ struct nlm_host *nlmclnt_lookup_host(const struct sockaddr *sap,
const u32 version,
const char *hostname,
int noresvport);
+void nlmclnt_release_host(struct nlm_host *);
struct nlm_host *nlmsvc_lookup_host(const struct svc_rqst *rqstp,
const char *hostname,
const size_t hostname_len);