Subject: Re: mount -u -r does not sync?
To: None <tech-kern@NetBSD.org>
From: David Young <dyoung@pobox.com>
List: tech-kern
Date: 06/23/2005 17:30:53 
In FreeBSD, note the ffs_sync call in ffs_mount's 'update' path,
src/sys/ufs/ffs/ffs_vfsops.c:

                if (fs->fs_ronly == 0 &&
                    vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0)) {
                        if ((error = vn_start_write(NULL, &mp, V_WAIT)) != 0)
                                return (error);
                        /*
                         * Flush any dirty data.
                         */
                        if ((error = ffs_sync(mp, MNT_WAIT, td)) != 0) {
                                vn_finished_write(mp);
                                return (error);
                        }
                        /*
                         * Check for and optionally get rid of files open
                         * for writing.
                         */
                        flags = WRITECLOSE;
                        if (mp->mnt_flag & MNT_FORCE)
                                flags |= FORCECLOSE;
                        if (mp->mnt_flag & MNT_SOFTDEP) {
                                error = softdep_flushfiles(mp, flags, td);
                        } else {
                                error = ffs_flushfiles(mp, flags, td);
                        }

Dave

-- 
David Young             OJC Technologies
dyoung@ojctech.com      Urbana, IL * (217) 278-3933