[PATCH] erofs-utils: lib: tar: fix garbage ns timestamps

[Gao Xiang]

Some "#if" directives were used incorrectly.

Fixes: 95d315fd7958 ("erofs-utils: introduce tarerofs")
Signed-off-by: Gao Xiang <hsiangkao at linux.alibaba.com>
---
 include/erofs/defs.h |  3 +++
 lib/tar.c            | 11 +++++------
 2 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/include/erofs/defs.h b/include/erofs/defs.h
index 310a6ab..e462338 100644
--- a/include/erofs/defs.h
+++ b/include/erofs/defs.h
@@ -332,15 +332,18 @@ unsigned long __roundup_pow_of_two(unsigned long n)
 #define ST_ATIM_NSEC(stbuf) ((stbuf)->st_atim.tv_nsec)
 #define ST_CTIM_NSEC(stbuf) ((stbuf)->st_ctim.tv_nsec)
 #define ST_MTIM_NSEC(stbuf) ((stbuf)->st_mtim.tv_nsec)
+#define ST_MTIM_NSEC_SET(stbuf, val) (stbuf)->st_mtim.tv_nsec = (val)
 #elif defined(HAVE_STRUCT_STAT_ST_ATIMENSEC)
 /* macOS */
 #define ST_ATIM_NSEC(stbuf) ((stbuf)->st_atimensec)
 #define ST_CTIM_NSEC(stbuf) ((stbuf)->st_ctimensec)
 #define ST_MTIM_NSEC(stbuf) ((stbuf)->st_mtimensec)
+#define ST_MTIM_NSEC_SET(stbuf, val) (stbuf)->st_mtimensec = (val)
 #else
 #define ST_ATIM_NSEC(stbuf) 0
 #define ST_CTIM_NSEC(stbuf) 0
 #define ST_MTIM_NSEC(stbuf) 0
+#define ST_MTIM_NSEC_SET(stbuf, val) do { } while (0)
 #endif
 
 #define __erofs_likely(x)      __builtin_expect(!!(x), 1)
diff --git a/lib/tar.c b/lib/tar.c
index cefda37..a9b425e 100644
--- a/lib/tar.c
+++ b/lib/tar.c
@@ -490,9 +490,9 @@ int tarerofs_parse_pax_header(struct erofs_iostream *ios,
 						ret = -EIO;
 						goto out;
 					}
-#if ST_MTIM_NSEC
-					ST_MTIM_NSEC(&eh->st) = n;
-#endif
+					ST_MTIM_NSEC_SET(&eh->st, n);
+				} else {
+					ST_MTIM_NSEC_SET(&eh->st, 0);
 				}
 				eh->use_mtime = true;
 			} else if (!strncmp(kv, "size=",
@@ -733,13 +733,12 @@ restart:
 
 	if (eh.use_mtime) {
 		st.st_mtime = eh.st.st_mtime;
-#if ST_MTIM_NSEC
-		ST_MTIM_NSEC(&st) = ST_MTIM_NSEC(&eh.st);
-#endif
+		ST_MTIM_NSEC_SET(&st, ST_MTIM_NSEC(&eh.st));
 	} else {
 		st.st_mtime = tarerofs_parsenum(th->mtime, sizeof(th->mtime));
 		if (errno)
 			goto invalid_tar;
+		ST_MTIM_NSEC_SET(&st, 0);
 	}
 
 	if (th->typeflag <= '7' && !eh.path) {
-- 
2.43.5