nfsd: add new io class tracepoint

Add some new tracepoints in the nfsd read/write codepaths. The idea
is that this will give us the ability to measure how long each phase of
a read or write operation takes.

Signed-off-by: Jeff Layton <jeff.layton@primarydata.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

1 files changed, 41 insertions, 0 deletions

diff --git a/fs/nfsd/trace.h b/fs/nfsd/trace.h
index 0befe762762b..3287041905da 100644
--- a/fs/nfsd/trace.h
+++ b/fs/nfsd/trace.h
@@ -8,6 +8,47 @@
 #define _NFSD_TRACE_H
 
 #include <linux/tracepoint.h>
+#include "nfsfh.h"
+
+DECLARE_EVENT_CLASS(nfsd_io_class,
+        TP_PROTO(struct svc_rqst *rqstp,
+                 struct svc_fh  *fhp,
+                 loff_t         offset,
+                 int            len),
+        TP_ARGS(rqstp, fhp, offset, len),
+        TP_STRUCT__entry(
+                __field(__be32, xid)
+                __field_struct(struct knfsd_fh, fh)
+                __field(loff_t, offset)
+                __field(int, len)
+        ),
+        TP_fast_assign(
+                __entry->xid = rqstp->rq_xid,
+                fh_copy_shallow(&__entry->fh, &fhp->fh_handle);
+                __entry->offset = offset;
+                __entry->len = len;
+        ),
+        TP_printk("xid=0x%x fh=0x%x offset=%lld len=%d",
+                  __be32_to_cpu(__entry->xid), knfsd_fh_hash(&__entry->fh),
+                  __entry->offset, __entry->len)
+)
+
+#define DEFINE_NFSD_IO_EVENT(name)              \
+DEFINE_EVENT(nfsd_io_class, name,               \
+        TP_PROTO(struct svc_rqst *rqstp,        \
+                 struct svc_fh  *fhp,           \
+                 loff_t         offset,         \
+                 int            len),           \
+        TP_ARGS(rqstp, fhp, offset, len))
+
+DEFINE_NFSD_IO_EVENT(read_start);
+DEFINE_NFSD_IO_EVENT(read_opened);
+DEFINE_NFSD_IO_EVENT(read_io_done);
+DEFINE_NFSD_IO_EVENT(read_done);
+DEFINE_NFSD_IO_EVENT(write_start);
+DEFINE_NFSD_IO_EVENT(write_opened);
+DEFINE_NFSD_IO_EVENT(write_io_done);
+DEFINE_NFSD_IO_EVENT(write_done);
 
 #include "state.h"