Commit adc9c2e5 authored by Darrick J. Wong's avatar Darrick J. Wong
Browse files

iomap: add a tracepoint for mappings returned by map_blocks 



Add a new tracepoint so we can see what mapping the filesystem returns
to writeback a dirty page.

Signed-off-by: default avatarDarrick J. Wong <djwong@kernel.org>
Reviewed-by: default avatarDave Chinner <dchinner@redhat.com>
parent 3d5f3ba1

fs/iomap/buffered-io.c

+1 −0
Original line number Diff line number Diff line
@@ -1360,6 +1360,7 @@ iomap_writepage_map(struct iomap_writepage_ctx *wpc, 
		error = wpc->ops->map_blocks(wpc, inode, pos);

		if (error)

			break;

		trace_iomap_writepage_map(inode, &wpc->iomap);

		if (WARN_ON_ONCE(wpc->iomap.type == IOMAP_INLINE))

			continue;

		if (wpc->iomap.type == IOMAP_HOLE)

fs/iomap/trace.h

+1 −0
Original line number Diff line number Diff line
@@ -148,6 +148,7 @@ DEFINE_EVENT(iomap_class, name, \ 
	TP_ARGS(inode, iomap))

DEFINE_IOMAP_EVENT(iomap_iter_dstmap);

DEFINE_IOMAP_EVENT(iomap_iter_srcmap);

DEFINE_IOMAP_EVENT(iomap_writepage_map);



TRACE_EVENT(iomap_iter,

	TP_PROTO(struct iomap_iter *iter, const void *ops,