NFSD: Trace filecache opens

Instrument calls to nfsd_open_verified() to get a sense of the
filecache hit rate.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

diff --git a/fs/nfsd/filecache.c b/fs/nfsd/filecache.c
index 24772f2..a7e3a44 100644 (file)
--- a/fs/nfsd/filecache.c
+++ b/fs/nfsd/filecache.c
@@ -995,10 +995,11 @@ open_file:
 
        nf->nf_mark = nfsd_file_mark_find_or_create(nf);
        if (nf->nf_mark) {
-               if (open)
+               if (open) {
                        status = nfsd_open_verified(rqstp, fhp, may_flags,
                                                    &nf->nf_file);
-               else
+                       trace_nfsd_file_open(nf, status);
+               } else
                        status = nfs_ok;
        } else
                status = nfserr_jukebox;

diff --git a/fs/nfsd/trace.h b/fs/nfsd/trace.h
index 242fa12..feb6e6f 100644 (file)
--- a/fs/nfsd/trace.h
+++ b/fs/nfsd/trace.h
@@ -784,6 +784,34 @@ TRACE_EVENT(nfsd_file_acquire,
                        __entry->nf_file, __entry->status)
 );
 
+TRACE_EVENT(nfsd_file_open,
+       TP_PROTO(struct nfsd_file *nf, __be32 status),
+       TP_ARGS(nf, status),
+       TP_STRUCT__entry(
+               __field(unsigned int, nf_hashval)
+               __field(void *, nf_inode)       /* cannot be dereferenced */
+               __field(int, nf_ref)
+               __field(unsigned long, nf_flags)
+               __field(unsigned long, nf_may)
+               __field(void *, nf_file)        /* cannot be dereferenced */
+       ),
+       TP_fast_assign(
+               __entry->nf_hashval = nf->nf_hashval;
+               __entry->nf_inode = nf->nf_inode;
+               __entry->nf_ref = refcount_read(&nf->nf_ref);
+               __entry->nf_flags = nf->nf_flags;
+               __entry->nf_may = nf->nf_may;
+               __entry->nf_file = nf->nf_file;
+       ),
+       TP_printk("hash=0x%x inode=%p ref=%d flags=%s may=%s file=%p",
+               __entry->nf_hashval,
+               __entry->nf_inode,
+               __entry->nf_ref,
+               show_nf_flags(__entry->nf_flags),
+               show_nfsd_may_flags(__entry->nf_may),
+               __entry->nf_file)
+)
+
 DECLARE_EVENT_CLASS(nfsd_file_search_class,
        TP_PROTO(struct inode *inode, unsigned int hash, int found),
        TP_ARGS(inode, hash, found),