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iomap: add a tracepoint for mappings returned by map_blocks

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

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
This commit is contained in:
Darrick J. Wong 2022-09-30 17:02:32 -07:00
parent 3d5f3ba1ac
commit adc9c2e5a7
2 changed files with 2 additions and 0 deletions
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1
fs/iomap/buffered-io.c
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@ -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)

1
fs/iomap/trace.h
View File

@ -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,