nfsd: add tracepoint to nfsd_rename

Observe the start of RENAME 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 e96585546d01fff1b4124788db9d6253c4d244ae..46091d7f2260cde8890bcff887a5d4d345223f9e 100644 (file)
--- a/fs/nfsd/trace.h
+++ b/fs/nfsd/trace.h
@@ -2522,6 +2522,37 @@ TRACE_EVENT(nfsd_vfs_unlink,
        )
 );
 
+TRACE_EVENT(nfsd_vfs_rename,
+       TP_PROTO(
+               const struct svc_rqst *rqstp,
+               const struct svc_fh *sfhp,
+               const struct svc_fh *tfhp,
+               const char *source,
+               unsigned int sourcelen,
+               const char *target,
+               unsigned int targetlen
+       ),
+       TP_ARGS(rqstp, sfhp, tfhp, source, sourcelen, target, targetlen),
+       TP_STRUCT__entry(
+               NFSD_TRACE_PROC_CALL_FIELDS(rqstp)
+               __field(u32, sfh_hash)
+               __field(u32, tfh_hash)
+               __string_len(source, source, sourcelen)
+               __string_len(target, target, targetlen)
+       ),
+       TP_fast_assign(
+               NFSD_TRACE_PROC_CALL_ASSIGNMENTS(rqstp);
+               __entry->sfh_hash = knfsd_fh_hash(&sfhp->fh_handle);
+               __entry->tfh_hash = knfsd_fh_hash(&tfhp->fh_handle);
+               __assign_str(source);
+               __assign_str(target);
+       ),
+       TP_printk("xid=0x%08x sfh_hash=0x%08x tfh_hash=0x%08x source=%s target=%s",
+               __entry->xid, __entry->sfh_hash, __entry->tfh_hash,
+               __get_str(source), __get_str(target)
+       )
+);
+
 #endif /* _NFSD_TRACE_H */
 
 #undef TRACE_INCLUDE_PATH

diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index 820290e5328f9e174c8aff1a2688f965216c4edf..41314b2a8199ae93ed156d140aa9e4b8e62b9e32 100644 (file)
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -1840,6 +1840,8 @@ nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen,
        int             host_err;
        bool            close_cached = false;
 
+       trace_nfsd_vfs_rename(rqstp, ffhp, tfhp, fname, flen, tname, tlen);
+
        err = fh_verify(rqstp, ffhp, S_IFDIR, NFSD_MAY_REMOVE);
        if (err)
                goto out;