[6.12-rc2 v2 PATCH 3/7] nfsd/localio: fix nfsd_file tracepoints to handle NULL rqstp

Mike Snitzer
2024-10-03T19:35:09Z

Otherwise nfsd_file_acquire, nfsd_file_insert_err, and
nfsd_file_cons_err will hit a NULL pointer when they are enabled and
LOCALIO used.

Example trace output (note xid is 0x0 and LOCALIO flag set):
nfsd_file_acquire: xid=0x0 inode=0000000069a1b2e7
may_flags=WRITE|LOCALIO ref=1 nf_flags=HASHED|GC nf_may=WRITE
nf_file=0000000070123234 status=0

Fixes: c63f0e48febf ("nfsd: add nfsd_file_acquire_local()")
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
---
fs/nfsd/trace.h | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/fs/nfsd/trace.h b/fs/nfsd/trace.h
index c625966cfcf3..b8470d4cbe99 100644
--- a/fs/nfsd/trace.h
+++ b/fs/nfsd/trace.h
@@ -1113,7 +1113,7 @@ TRACE_EVENT(nfsd_file_acquire,
),

TP_fast_assign(
- __entry->xid = be32_to_cpu(rqstp->rq_xid);
+ __entry->xid = rqstp ? be32_to_cpu(rqstp->rq_xid) : 0;
__entry->inode = inode;
__entry->may_flags = may_flags;
__entry->nf_ref = nf ? refcount_read(&nf->nf_ref) : 0;
@@ -1147,7 +1147,7 @@ TRACE_EVENT(nfsd_file_insert_err,
__field(long, error)
),
TP_fast_assign(
- __entry->xid = be32_to_cpu(rqstp->rq_xid);
+ __entry->xid = rqstp ? be32_to_cpu(rqstp->rq_xid) : 0;
__entry->inode = inode;
__entry->may_flags = may_flags;
__entry->error = error;
@@ -1177,7 +1177,7 @@ TRACE_EVENT(nfsd_file_cons_err,
__field(const void *, nf_file)
),
TP_fast_assign(
- __entry->xid = be32_to_cpu(rqstp->rq_xid);
+ __entry->xid = rqstp ? be32_to_cpu(rqstp->rq_xid) : 0;
__entry->inode = inode;
__entry->may_flags = may_flags;
__entry->nf_ref = refcount_read(&nf->nf_ref);
--
2.44.0