fsmonitor: use fsmonitor data in `git diff`av/fsmonitor-updates

This makes use of the fsmonitor extension to skip lstat() calls on
files that fsmonitor judged as unmodified.  We skip use of the
fsmonitor extension when called by "add" because the format_callback
in such cases expects to be called even when the file is believed to
be "up to date" with the index.

Signed-off-by: Alex Vandiver <alexmv@dropbox.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/builtin/add.c b/builtin/add.c
index bf01d89e28..bba20b46e0 100644
--- a/builtin/add.c
+++ b/builtin/add.c
@@ -119,7 +119,7 @@ int add_files_to_cache(const char *prefix,
 	rev.diffopt.format_callback_data = &data;
 	rev.diffopt.flags.override_submodule_config = 1;
 	rev.max_count = 0; /* do not compare unmerged paths with stage #2 */
-	run_diff_files(&rev, DIFF_RACY_IS_MODIFIED);
+	run_diff_files(&rev, DIFF_RACY_IS_MODIFIED | DIFF_SKIP_FSMONITOR);
 	clear_pathspec(&rev.prune_data);
 	return !!data.add_errors;
 }