From 272e2b89b88a384f204d542b64bde0fb8e1fc12a Mon Sep 17 00:00:00 2001 From: Jeff Layton Date: Sat, 3 May 2025 15:59:25 -0400 Subject: [PATCH] nfsd: add tracepoint to nfsd_link() Observe the start of NFS LINK operations. Signed-off-by: Jeff Layton Signed-off-by: Chuck Lever --- 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; -- 2.50.1