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| author | Chuck Lever <chuck.lever@oracle.com> | 2008-01-12 01:09:59 +0300 |
|---|---|---|
| committer | Trond Myklebust <Trond.Myklebust@netapp.com> | 2008-01-30 10:06:07 +0300 |
| commit | 1093a60ef34bb12010fe7ea4b780bee1c57cfbbe (patch) | |
| tree | bc558d58ae38aab7e615883eceef1ec253c2d646 /include/linux/lockd | |
| parent | 9289e7f91add1c09c3ec8571a2080f7507730b8d (diff) | |
| download | linux-1093a60ef34bb12010fe7ea4b780bee1c57cfbbe.tar.xz | |
NLM/NFS: Use cached nlm_host when calling nlmclnt_proc()
Now that each NFS mount point caches its own nlm_host structure, it can be
passed to nlmclnt_proc() for each lock request. By pinning an nlm_host for
each mount point, we trade the overhead of looking up or creating a fresh
nlm_host struct during every NLM procedure call for a little extra memory.
We also restrict the nlmclnt_proc symbol to limit the use of this call to
in-tree modules.
Note that nlm_lookup_host() (just removed from the client's per-request
NLM processing) could also trigger an nlm_host garbage collection. Now
client-side nlm_host garbage collection occurs only during NFS mount
processing. Since the NFS client now holds a reference on these nlm_host
structures, they wouldn't have been affected by garbage collection
anyway.
Given that nlm_lookup_host() reorders the global nlm_host chain after
every successful lookup, and that a garbage collection could be triggered
during the call, we've removed a significant amount of per-NLM-request
CPU processing overhead.
Sidebar: there are only a few remaining references to the internals of
NFS inodes in the client-side NLM code. The only references I found are
related to extracting or comparing the inode's file handle via NFS_FH().
One is in nlmclnt_grant(); the other is in nlmclnt_setlockargs().
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/bind.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/include/linux/lockd/bind.h b/include/linux/lockd/bind.h index ad5402f5456b..73368075af03 100644 --- a/include/linux/lockd/bind.h +++ b/include/linux/lockd/bind.h @@ -42,7 +42,8 @@ extern struct nlm_host *nlmclnt_init(const char *server_name, u32 nfs_version); extern void nlmclnt_done(struct nlm_host *host); -extern int nlmclnt_proc(struct inode *, int, struct file_lock *); +extern int nlmclnt_proc(struct nlm_host *host, int cmd, + struct file_lock *fl); extern int lockd_up(int proto); extern void lockd_down(void); |