nfsd: add tracepoint to nfsd_symlink

Observe the start of SYMLINK operations for all NFS versions.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

diff --git a/fs/nfsd/trace.h b/fs/nfsd/trace.h
index a71d605fd7b7acd63fb8bbafd4717a008f75c227..e347cdaaa732f94c6853108687ef8d4d6b75f0fc 100644 (file)
--- a/fs/nfsd/trace.h
+++ b/fs/nfsd/trace.h
@@ -2444,6 +2444,33 @@ TRACE_EVENT(nfsd_vfs_create,
        )
 );
 
+TRACE_EVENT(nfsd_vfs_symlink,
+       TP_PROTO(
+               const struct svc_rqst *rqstp,
+               const struct svc_fh *fhp,
+               const char *name,
+               unsigned int namelen,
+               const char *target
+       ),
+       TP_ARGS(rqstp, fhp, name, namelen, target),
+       TP_STRUCT__entry(
+               NFSD_TRACE_PROC_CALL_FIELDS(rqstp)
+               __field(u32, fh_hash)
+               __string_len(name, name, namelen)
+               __string(target, target)
+       ),
+       TP_fast_assign(
+               NFSD_TRACE_PROC_CALL_ASSIGNMENTS(rqstp);
+               __entry->fh_hash = knfsd_fh_hash(&fhp->fh_handle);
+               __assign_str(name);
+               __assign_str(target);
+       ),
+       TP_printk("xid=0x%08x fh_hash=0x%08x name=%s target=%s",
+               __entry->xid, __entry->fh_hash,
+               __get_str(name), __get_str(target)
+       )
+);
+
 #endif /* _NFSD_TRACE_H */
 
 #undef TRACE_INCLUDE_PATH

diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index cc0efc47dc254f461a4e269e513d628cc004016e..ecd453b260b6e2349d68f3b41d3c3f9dd7347b32 100644 (file)
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -1651,6 +1651,8 @@ nfsd_symlink(struct svc_rqst *rqstp, struct svc_fh *fhp,
        __be32          err, cerr;
        int             host_err;
 
+       trace_nfsd_vfs_symlink(rqstp, fhp, fname, flen, path);
+
        err = nfserr_noent;
        if (!flen || path[0] == '\0')
                goto out;