On Fri, May 26, 2017 at 11:52:42AM +0200, Richard Weinberger wrote: > Hyunchul, > > Am 26.05.2017 um 01:30 schrieb Hyunchul Lee: > > From: Hyunchul Lee <cheol.lee@xxxxxxx> > > > > for un/freeze support, implement freeze_super and un/freeze_fs > > of super_operations. > > ubifs_freeze_super just calls freeze_super. because freeze_super always > > succeeds if file system is read-only, UBIFS errors should be checked. > > if there are errors, UBIFS is switched to read-only mode. > > ubifs_freeze_fs runs commit if TNC/LPT isn't clean. though all writes > > are blocked and sync_fs is called before, if commit alreay was started > > before writes are blocked, TNC/LPT might have dirty COW nodes. > > you explain how you implement that feature, but not why. > What is the use-case? > I always thought this interface is only being used by LVM. It can also be used through the FIFREEZE ioctl, but without snapshots underneath the fs it's not all that useful.
