O_NOATIME flag requires effective UID of process matches file's owner
or has CAP_FOWNER capabilities. Fallback to open without O_NOATIME flag
so that normal user can also call find_mount_root().
This is a preparation work to allow normal user to call "subvolume show".
Signed-off-by: Tomohiro Misono <misono.tomoh...@jp.fujitsu.com>
---
utils.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/utils.c b/utils.c
index 81c54faa..acea70a5 100644
--- a/utils.c
+++ b/utils.c
@@ -2045,6 +2045,9 @@ int find_mount_root(const char *path, char **mount_root)
char *longest_match = NULL;
fd = open(path, O_RDONLY | O_NOATIME);
+ if (fd < 0 && errno == EPERM)
+ fd = open(path, O_RDONLY);
+
if (fd < 0)
return -errno;
close(fd);
--
2.14.3
--
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