NFS: add I/O performance counters
Invoke the byte and event counter macros where we want to count bytes and
events.
Clean-up: fix a possible NULL dereference in nfs_lock, and simplify
nfs_file_open.
Test-plan:
fsx and iozone on UP and SMP systems, with and without pre-emption. Watch
for memory overwrite bugs, and performance loss (significantly more CPU
required per op).
Signed-off-by: Chuck Lever <cel@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index a1554be..151b8dd 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -34,6 +34,7 @@
#include "nfs4_fs.h"
#include "delegation.h"
+#include "iostat.h"
#define NFS_PARANOIA 1
/* #define NFS_DEBUG_VERBOSE 1 */
@@ -507,6 +508,8 @@
struct nfs_fattr fattr;
long res;
+ nfs_inc_stats(inode, NFSIOS_VFSGETDENTS);
+
lock_kernel();
res = nfs_revalidate_inode(NFS_SERVER(inode), inode);
@@ -713,6 +716,7 @@
parent = dget_parent(dentry);
lock_kernel();
dir = parent->d_inode;
+ nfs_inc_stats(dir, NFSIOS_DENTRYREVALIDATE);
inode = dentry->d_inode;
if (!inode) {
@@ -844,6 +848,7 @@
dfprintk(VFS, "NFS: lookup(%s/%s)\n",
dentry->d_parent->d_name.name, dentry->d_name.name);
+ nfs_inc_stats(dir, NFSIOS_VFSLOOKUP);
res = ERR_PTR(-ENAMETOOLONG);
if (dentry->d_name.len > NFS_SERVER(dir)->namelen)
@@ -1241,6 +1246,7 @@
dfprintk(VFS, "NFS: silly-rename(%s/%s, ct=%d)\n",
dentry->d_parent->d_name.name, dentry->d_name.name,
atomic_read(&dentry->d_count));
+ nfs_inc_stats(dir, NFSIOS_SILLYRENAME);
#ifdef NFS_PARANOIA
if (!dentry->d_inode)
@@ -1640,6 +1646,8 @@
struct rpc_cred *cred;
int res = 0;
+ nfs_inc_stats(inode, NFSIOS_VFSACCESS);
+
if (mask == 0)
goto out;
/* Is this sys_access() ? */