On 05/11/2010 07:25 AM, Hajime Taira wrote: > Here is patch that add new command fsfreeze. > 'fsfreeze' suspend and resume access to an filesystem (Linux Ext3/4, ReiserFS, JFS, XFS) > It like xfs_freeze command for XFS filesystem. I ported one for other filesystem. > Because util-linux-ng should have this. I think so. > > usage: > # fsfreeze -f /var/ftp > # lvcreate -s -L 10G -n ls_ftpd_snap /dev/vg_data/lv_ftpd > # fsfreeze -u /var/ftp This example is wrong, device-mapper code always calls freeze_bdev() here (which is the same like fsfreeze ioctl). Actually, every DM suspend ioctl calls this if there is nolockfs flag specified (see man dmsetup suspend --nolockfs description). Calling xfs_freeze (or fsfreeze) before lvcreate -s is obsolete, please avoid this! (I guess fs is already unfrozen before the fsfreeze -u call above.) (And there was bug in some kernel that calling twice freeze caused real freeze:-) Milan -- To unsubscribe from this list: send the line "unsubscribe util-linux-ng" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
