[PATCH v4 07/18] nfsd: add tracepoint to nfsd_link()

cel
2025-05-03T19:59:48Z

fs/nfsd/trace.h | 27 +++++++++++++++++++++++++++
fs/nfsd/vfs.c | 2 ++
2 files changed, 29 insertions(+)

diff --git a/fs/nfsd/trace.h b/fs/nfsd/trace.h
index e347cdaaa732..acbf94cfb720 100644
--- a/fs/nfsd/trace.h
+++ b/fs/nfsd/trace.h
@@ -2471,6 +2471,33 @@ TRACE_EVENT(nfsd_vfs_symlink,
)
);

+TRACE_EVENT(nfsd_vfs_link,
+ TP_PROTO(
+ const struct svc_rqst *rqstp,
+ const struct svc_fh *sfhp,
+ const struct svc_fh *tfhp,
+ const char *name,
+ unsigned int namelen
+ ),
+ TP_ARGS(rqstp, sfhp, tfhp, name, namelen),
+ TP_STRUCT__entry(
+ NFSD_TRACE_PROC_CALL_FIELDS(rqstp)
+ __field(u32, sfh_hash)
+ __field(u32, tfh_hash)
+ __string_len(name, name, namelen)
+ ),
+ 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(name);
+ ),
+ TP_printk("xid=0x%08x src_fh=0x%08x tgt_fh=0x%08x name=%s",
+ __entry->xid, __entry->sfh_hash, __entry->tfh_hash,
+ __get_str(name)
+ )
+);
+
#endif /* _NFSD_TRACE_H */

#undef TRACE_INCLUDE_PATH
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index ecd453b260b6..30702f36db98 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -1721,6 +1721,8 @@ nfsd_link(struct svc_rqst *rqstp, struct svc_fh *ffhp,
__be32 err;
int host_err;

+ trace_nfsd_vfs_link(rqstp, ffhp, tfhp, name, len);
+
err = fh_verify(rqstp, ffhp, S_IFDIR, NFSD_MAY_CREATE);
if (err)
goto out;
--
2.49.0