[PATCH 6/7] iomap: trace iomap_zero_iter zeroing activities

["Darrick J. Wong" <djwong@xxxxxxxxxx>]

From: Darrick J. Wong <djwong@xxxxxxxxxx>

Trace which bytes actually get zeroed.

Signed-off-by: "Darrick J. Wong" <djwong@xxxxxxxxxx>
---
 fs/iomap/trace.h       |    1 +
 fs/iomap/buffered-io.c |    3 +++
 2 files changed, 4 insertions(+)


diff --git a/fs/iomap/trace.h b/fs/iomap/trace.h
index 455cc6f90be031..c71e432d96bcdb 100644
--- a/fs/iomap/trace.h
+++ b/fs/iomap/trace.h
@@ -84,6 +84,7 @@ DEFINE_RANGE_EVENT(iomap_release_folio);
 DEFINE_RANGE_EVENT(iomap_invalidate_folio);
 DEFINE_RANGE_EVENT(iomap_dio_invalidate_fail);
 DEFINE_RANGE_EVENT(iomap_dio_rw_queued);
+DEFINE_RANGE_EVENT(iomap_zero_iter);
 
 #define IOMAP_TYPE_STRINGS \
 	{ IOMAP_HOLE,		"HOLE" }, \
diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
index f526d634bfeda5..53324b0222de6b 100644
--- a/fs/iomap/buffered-io.c
+++ b/fs/iomap/buffered-io.c
@@ -1400,6 +1400,9 @@ static int iomap_zero_iter(struct iomap_iter *iter, bool *did_zero)
 		/* warn about zeroing folios beyond eof that won't write back */
 		WARN_ON_ONCE(folio_pos(folio) > iter->inode->i_size);
 
+		trace_iomap_zero_iter(iter->inode, folio_pos(folio) + offset,
+				bytes);
+
 		folio_zero_range(folio, offset, bytes);
 		folio_mark_accessed(folio);