> > dm-ioctl.h: > > /* > > * Set this to avoid attempting to freeze any filesystem when suspending. > > */ > > #define DM_SKIP_LOCKFS_FLAG (1 << 10) /* In */ > Thanks. I was now checking in detail and indeed FIFREEZE fails if > ->freeze_fs is not set. And only xfs, ext3, ext4, reiserfs, jfs, nilfs2, > and gfs2 provide this function. So I was correct in assuming that when > filesystem supports FIFREEZE it must make sure no modifications happen to > the filesystem. So I believe that my original plan for sync to skip frozen > filesystem is correct. > > Honza LVM doesn't suspend with FIFREEZE, it calls freeze_bdev directly from drivers/md/dm.c (and it works for all filesystems, including ext2). So if you skip sync of frozen filesystems, you introduce a data corruption if someone takes a snapshot of ext2. Mikulas -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
