[PATCH v3 v3 7/7] ntfs3: add file I/O tracepoints

From: Baolin Liu <[email protected]>

Add ntfs3 tracepoints for file I/O operations.

This adds trace events for ntfs_file_read_iter() and
ntfs_file_write_iter() to help observe file read and
write activity.

Signed-off-by: Baolin Liu <[email protected]>
---
 fs/ntfs3/file.c              |  5 +++++
 include/trace/events/ntfs3.h | 33 +++++++++++++++++++++++++++++++++
 2 files changed, 38 insertions(+)

diff --git a/fs/ntfs3/file.c b/fs/ntfs3/file.c
index d601f088618c..a260a57ebd65 100644
--- a/fs/ntfs3/file.c
+++ b/fs/ntfs3/file.c
@@ -20,6 +20,7 @@
 #include "debug.h"
 #include "ntfs.h"
 #include "ntfs_fs.h"
+#include <trace/events/ntfs3.h>
 
 /*
  * cifx, btrfs, exfat, ext4, f2fs use this constant.
@@ -822,6 +823,8 @@ static ssize_t ntfs_file_read_iter(struct kiocb *iocb, struct iov_iter *iter)
 	unsigned int dio_flags;
 	ssize_t err;
 
+	trace_ntfs3_file_read_iter(iocb, iter);
+
 	err = check_read_restriction(inode);
 	if (err)
 		return err;
@@ -1225,6 +1228,8 @@ static ssize_t ntfs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
 	loff_t vbo, endbyte;
 	ssize_t ret, err;
 
+	trace_ntfs3_file_write_iter(iocb, from);
+
 	if (!inode_trylock(inode)) {
 		if (iocb->ki_flags & IOCB_NOWAIT)
 			return -EAGAIN;
diff --git a/include/trace/events/ntfs3.h b/include/trace/events/ntfs3.h
index 7a94c2788295..c76fe265fb79 100644
--- a/include/trace/events/ntfs3.h
+++ b/include/trace/events/ntfs3.h
@@ -351,6 +351,39 @@ TRACE_EVENT(ntfs3_iomap_end,
 		  __entry->written, __entry->flags)
 );
 
+DECLARE_EVENT_CLASS(ntfs3_file_class,
+	TP_PROTO(struct kiocb *iocb, struct iov_iter *iter),
+	TP_ARGS(iocb, iter),
+	TP_STRUCT__entry(
+		__field(loff_t, size)
+		__field(loff_t, offset)
+		__field(size_t, count)
+		__field(unsigned long, ino)
+		__field(dev_t, dev)
+	),
+	TP_fast_assign(
+		__entry->size = i_size_read(file_inode(iocb->ki_filp));
+		__entry->offset = iocb->ki_pos;
+		__entry->count = iov_iter_count(iter);
+		__entry->ino = file_inode(iocb->ki_filp)->i_ino;
+		__entry->dev = file_inode(iocb->ki_filp)->i_sb->s_dev;
+	),
+	TP_printk("dev=(%d,%d) ino=%lu size=%lld pos=%lld bytecount=%zu",
+		  MAJOR(__entry->dev), MINOR(__entry->dev),
+		  __entry->ino, __entry->size, __entry->offset,
+		  __entry->count)
+);
+
+DEFINE_EVENT(ntfs3_file_class, ntfs3_file_read_iter,
+	TP_PROTO(struct kiocb *iocb, struct iov_iter *iter),
+	TP_ARGS(iocb, iter)
+);
+
+DEFINE_EVENT(ntfs3_file_class, ntfs3_file_write_iter,
+	TP_PROTO(struct kiocb *iocb, struct iov_iter *iter),
+	TP_ARGS(iocb, iter)
+);
+
 #endif /* _TRACE_NTFS3_H */
 
 #include <trace/define_trace.h>
-- 
2.51.0