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author | Chuck Lever <chuck.lever@oracle.com> | 2008-01-11 17:09:59 -0500 |
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committer | Trond Myklebust <Trond.Myklebust@netapp.com> | 2008-01-30 02:06:07 -0500 |
commit | 1093a60ef34bb12010fe7ea4b780bee1c57cfbbe (patch) | |
tree | bc558d58ae38aab7e615883eceef1ec253c2d646 /fs/nfs | |
parent | 9289e7f91add1c09c3ec8571a2080f7507730b8d (diff) | |
download | linux-1093a60ef34bb12010fe7ea4b780bee1c57cfbbe.tar.gz linux-1093a60ef34bb12010fe7ea4b780bee1c57cfbbe.tar.bz2 linux-1093a60ef34bb12010fe7ea4b780bee1c57cfbbe.zip |
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 'fs/nfs')
-rw-r--r-- | fs/nfs/nfs3proc.c | 4 | ||||
-rw-r--r-- | fs/nfs/proc.c | 4 |
2 files changed, 6 insertions, 2 deletions
diff --git a/fs/nfs/nfs3proc.c b/fs/nfs/nfs3proc.c index e68580ebaa47..b353c1a05bfd 100644 --- a/fs/nfs/nfs3proc.c +++ b/fs/nfs/nfs3proc.c @@ -767,7 +767,9 @@ static void nfs3_proc_commit_setup(struct nfs_write_data *data, struct rpc_messa static int nfs3_proc_lock(struct file *filp, int cmd, struct file_lock *fl) { - return nlmclnt_proc(filp->f_path.dentry->d_inode, cmd, fl); + struct inode *inode = filp->f_path.dentry->d_inode; + + return nlmclnt_proc(NFS_SERVER(inode)->nlm_host, cmd, fl); } const struct nfs_rpc_ops nfs_v3_clientops = { diff --git a/fs/nfs/proc.c b/fs/nfs/proc.c index c9f46a24e75c..5ccf7faee19c 100644 --- a/fs/nfs/proc.c +++ b/fs/nfs/proc.c @@ -593,7 +593,9 @@ nfs_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg) static int nfs_proc_lock(struct file *filp, int cmd, struct file_lock *fl) { - return nlmclnt_proc(filp->f_path.dentry->d_inode, cmd, fl); + struct inode *inode = filp->f_path.dentry->d_inode; + + return nlmclnt_proc(NFS_SERVER(inode)->nlm_host, cmd, fl); } |