[PATCH] Add caller function output to xfs_log_force tracepoint

[Carlos Maiolino <cmaiolino@xxxxxxxxxx>]

I had sent this patch yesterday, but for some reason it didn't reach xfs list,
sending again.


Output the caller of xfs_log_force might be useful when tracing log checkpoint
problems without the need to build kernel with DEBUG.

Signed-off-by: Carlos Maiolino <cmaiolino@xxxxxxxxxx>
---
 fs/xfs/xfs_log.c   |  4 ++--
 fs/xfs/xfs_trace.h | 10 ++++++----
 2 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/fs/xfs/xfs_log.c b/fs/xfs/xfs_log.c
index b49ccf5..8c08015b 100644
--- a/fs/xfs/xfs_log.c
+++ b/fs/xfs/xfs_log.c
@@ -3378,7 +3378,7 @@ xfs_log_force(
 {
        int     error;
 
-       trace_xfs_log_force(mp, 0);
+       trace_xfs_log_force(mp, 0, _RET_IP_);
        error = _xfs_log_force(mp, flags, NULL);
        if (error)
                xfs_warn(mp, "%s: error %d returned.", __func__, error);
@@ -3527,7 +3527,7 @@ xfs_log_force_lsn(
 {
        int     error;
 
-       trace_xfs_log_force(mp, lsn);
+       trace_xfs_log_force(mp, lsn, _RET_IP_);
        error = _xfs_log_force_lsn(mp, lsn, flags, NULL);
        if (error)
                xfs_warn(mp, "%s: error %d returned.", __func__, error);
diff --git a/fs/xfs/xfs_trace.h b/fs/xfs/xfs_trace.h
index c8d5842..384bb17 100644
--- a/fs/xfs/xfs_trace.h
+++ b/fs/xfs/xfs_trace.h
@@ -1053,19 +1053,21 @@ DECLARE_EVENT_CLASS(xfs_log_item_class,
 )
 
 TRACE_EVENT(xfs_log_force,
-       TP_PROTO(struct xfs_mount *mp, xfs_lsn_t lsn),
-       TP_ARGS(mp, lsn),
+       TP_PROTO(struct xfs_mount *mp, xfs_lsn_t lsn, unsigned long caller_ip),
+       TP_ARGS(mp, lsn, caller_ip),
        TP_STRUCT__entry(
                __field(dev_t, dev)
                __field(xfs_lsn_t, lsn)
+               __field(unsigned long, caller_ip)
        ),
        TP_fast_assign(
                __entry->dev = mp->m_super->s_dev;
                __entry->lsn = lsn;
+               __entry->caller_ip = caller_ip;
        ),
-       TP_printk("dev %d:%d lsn 0x%llx",
+       TP_printk("dev %d:%d lsn 0x%llx caller %ps",
                  MAJOR(__entry->dev), MINOR(__entry->dev),
-                 __entry->lsn)
+                 __entry->lsn, (void *)__entry->caller_ip)
 )
 
 #define DEFINE_LOG_ITEM_EVENT(name) \
-- 
2.4.3