Speed up pw operations that edit /etc/group or /etc/passwd

r285050 fixed a bug in pw that could lead to /etc/passwd or /etc/group
corruption on power loss. However, it fixed it by opening those files with
O_SYNC, which is very slow, especially on ZFS. This change replaces O_SYNC
with appropriately placed fsync()s instead, which is much faster. Using a
ZFS tmpdir, the time to run pw's kyua tests drops from 245s to 35s.

Reviewed by:	allanjude, bapt, vangyzen, garga
Tested on pfSense by:	garga
MFC after:	4 weeks
Sponsored by:	Spectra Logic Corp
Differential Revision:	https://reviews.freebsd.org/D8319

3 files changed, 3 insertions, 0 deletions

diff --git a/pw/grupd.c b/pw/grupd.c
index 38d5e5b..5d0df02 100644
--- a/pw/grupd.c
+++ b/pw/grupd.c
@@ -77,6 +77,7 @@ gr_update(struct group * grp, char const * group)
 		close(tfd);
 		err(1, "gr_copy()");
 	}
+	fsync(tfd);
 	close(tfd);
 	if (gr_mkdb() == -1) {
 		gr_fini();
diff --git a/pw/pw_nis.c b/pw/pw_nis.c
index 35b26ea..087c946 100644
--- a/pw/pw_nis.c
+++ b/pw/pw_nis.c
@@ -67,6 +67,7 @@ pw_nisupdate(const char * path, struct passwd * pwd, char const * user)
 		close(tfd);
 		err(1, "pw_copy()");
 	}
+	fsync(tfd);
 	close(tfd);
 	if (chmod(pw_tempname(), 0644) == -1)
 		err(1, "chmod()");
diff --git a/pw/pwupd.c b/pw/pwupd.c
index 3bcb95f..87c3c99 100644
--- a/pw/pwupd.c
+++ b/pw/pwupd.c
@@ -114,6 +114,7 @@ pw_update(struct passwd * pwd, char const * user)
 		close(tfd);
 		err(1, "pw_copy()");
 	}
+	fsync(tfd);
 	close(tfd);
 	/*
 	 * in case of deletion of a user, the whole database