On Wed, Nov 08, 2006 at 01:00:17AM +0100, Rafael J. Wysocki wrote: > > However, XFS_IOC_FREEZE happily returns 0 after calling freeze_bdev(), > apparetnly assuming that it won't fail. Because it _can't_ fail at this point. We've got an active superblock, because we've had to open a fd on the filesystem to get to the point where we can issue the ioctl. Hence the get_super() call will always succeed and the freeze will be executed if we are not read only. The superblock state changes if the freeze goes ahead, and XFS uses this state change to determine what to do when the thaw command is sent. Cheers, Dave. -- Dave Chinner Principal Engineer SGI Australian Software Group -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
