From b442f00957395ba59112d4d0e0eb4f71708d811b Mon Sep 17 00:00:00 2001 From: Alan Somers Date: Fri, 18 Nov 2016 16:07:08 +0000 Subject: 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 --- pw/pwupd.c | 1 + 1 file changed, 1 insertion(+) (limited to 'pw/pwupd.c') 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 -- cgit v1.2.3