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 non-privileged user can also call find_mount_root(). This is a preparation work to allow non-privileged user to call "subvolume show". Signed-off-by: Misono Tomohiro <misono.tomohiro@xxxxxxxxxxxxxx> Signed-off-by: David Sterba <dsterba@xxxxxxxx> --- utils.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/utils.c b/utils.c index 3a4bc92a..8ce8417d 100644 --- a/utils.c +++ b/utils.c @@ -2054,6 +2054,9 @@ 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); -- 2.19.1
