On Thu, Aug 22, 2024 at 05:01:22PM -0700, Darrick J. Wong wrote: > From: Darrick J. Wong <djwong@xxxxxxxxxx> > > This patch introduces two more new ioctls to manage atomic updates to > file contents -- XFS_IOC_START_COMMIT and XFS_IOC_COMMIT_RANGE. The > commit mechanism here is exactly the same as what XFS_IOC_EXCHANGE_RANGE > does, but with the additional requirement that file2 cannot have changed > since some sampling point. The start-commit ioctl performs the sampling > of file attributes. The code itself looks simply enough now, but how do we guarantee that ctime actually works as a full change count and not just by chance here?
