[PATCH v4 05/18] nfsd: add nfsd_vfs_create tracepoints

[cel]

From: Jeff Layton <jlayton@xxxxxxxxxx>

Observe the start of file and directory creation for all NFS
versions.

Signed-off-by: Jeff Layton <jlayton@xxxxxxxxxx>
Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
---
 fs/nfsd/nfs3proc.c |  3 +++
 fs/nfsd/trace.h    | 27 +++++++++++++++++++++++++++
 fs/nfsd/vfs.c      |  2 ++
 3 files changed, 32 insertions(+)

diff --git a/fs/nfsd/nfs3proc.c b/fs/nfsd/nfs3proc.c
index 372bdcf5e07a..5d2b081072e8 100644
--- a/fs/nfsd/nfs3proc.c
+++ b/fs/nfsd/nfs3proc.c
@@ -14,6 +14,7 @@
 #include "xdr3.h"
 #include "vfs.h"
 #include "filecache.h"
+#include "trace.h"
 
 #define NFSDDBG_FACILITY		NFSDDBG_PROC
 
@@ -266,6 +267,8 @@ nfsd3_create_file(struct svc_rqst *rqstp, struct svc_fh *fhp,
 	__be32 status;
 	int host_err;
 
+	trace_nfsd_vfs_create(rqstp, fhp, S_IFREG, argp->name, argp->len);
+
 	if (isdotent(argp->name, argp->len))
 		return nfserr_exist;
 	if (!(iap->ia_valid & ATTR_MODE))
diff --git a/fs/nfsd/trace.h b/fs/nfsd/trace.h
index 661a870d62f5..a71d605fd7b7 100644
--- a/fs/nfsd/trace.h
+++ b/fs/nfsd/trace.h
@@ -2417,6 +2417,33 @@ TRACE_EVENT(nfsd_vfs_lookup,
 	)
 );
 
+TRACE_EVENT(nfsd_vfs_create,
+	TP_PROTO(
+		const struct svc_rqst *rqstp,
+		const struct svc_fh *fhp,
+		umode_t type,
+		const char *name,
+		unsigned int len
+	),
+	TP_ARGS(rqstp, fhp, type, name, len),
+	TP_STRUCT__entry(
+		NFSD_TRACE_PROC_CALL_FIELDS(rqstp)
+		__field(u32, fh_hash)
+		__field(umode_t, type)
+		__string_len(name, name, len)
+	),
+	TP_fast_assign(
+		NFSD_TRACE_PROC_CALL_ASSIGNMENTS(rqstp);
+		__entry->fh_hash = knfsd_fh_hash(&fhp->fh_handle);
+		__entry->type = type;
+		__assign_str(name);
+	),
+	TP_printk("xid=0x%08x fh_hash=0x%08x type=%s name=%s",
+		__entry->xid, __entry->fh_hash,
+		show_fs_file_type(__entry->type), __get_str(name)
+	)
+);
+
 #endif /* _NFSD_TRACE_H */
 
 #undef TRACE_INCLUDE_PATH
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index 657ba0c2da14..cc0efc47dc25 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -1549,6 +1549,8 @@ nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp,
 	__be32		err;
 	int		host_err;
 
+	trace_nfsd_vfs_create(rqstp, fhp, type, fname, flen);
+
 	if (isdotent(fname, flen))
 		return nfserr_exist;
 
-- 
2.49.0