Commit a5256e68 authored by Jeff Layton's avatar Jeff Layton Committed by Chuck Lever
Browse files

nfsd: add a tracepoint to nfsd_lookup_dentry 



Replace the dprintk in nfsd_lookup_dentry() with a trace point.
nfsd_lookup_dentry() is called frequently enough that enabling this
dprintk call site would result in log floods and performance issues.

Signed-off-by: default avatarJeff Layton <jlayton@kernel.org>
Signed-off-by: default avatarChuck Lever <chuck.lever@oracle.com>
parent adbdd746

fs/nfsd/trace.h

+23 −0
Original line number Diff line number Diff line
@@ -2394,6 +2394,29 @@ TRACE_EVENT(nfsd_vfs_setattr, 
	)

)



TRACE_EVENT(nfsd_vfs_lookup,

	TP_PROTO(

		const struct svc_rqst *rqstp,

		const struct svc_fh *fhp,

		const char *name,

		unsigned int len

	),

	TP_ARGS(rqstp, fhp, name, len),

	TP_STRUCT__entry(

		NFSD_TRACE_PROC_CALL_FIELDS(rqstp)

		__field(u32, fh_hash)

		__string_len(name, name, len)

	),

	TP_fast_assign(

		NFSD_TRACE_PROC_CALL_ASSIGNMENTS(rqstp);

		__entry->fh_hash = knfsd_fh_hash(&fhp->fh_handle);

		__assign_str(name);

	),

	TP_printk("xid=0x%08x fh_hash=0x%08x name=%s",

		__entry->xid, __entry->fh_hash, __get_str(name)

	)

);



#endif /* _NFSD_TRACE_H */



#undef TRACE_INCLUDE_PATH

fs/nfsd/vfs.c

+1 −1
Original line number Diff line number Diff line
@@ -246,7 +246,7 @@ nfsd_lookup_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp, 
	struct dentry		*dentry;

	int			host_err;



	dprintk("nfsd: nfsd_lookup(fh %s, %.*s)\n", SVCFH_fmt(fhp), len,name);

	trace_nfsd_vfs_lookup(rqstp, fhp, name, len);



	dparent = fhp->fh_dentry;

	exp = exp_get(fhp->fh_export);