On Wed, Jul 31, 2013 at 06:01:54PM -0400, Theodore Ts'o wrote: > Have you considered what happens if you have a 10 megabyte file, of > which the first 5 megs are mmap'ed into a userspace process. > > Now suppose you call COLLAPASE_RANGE on a one megabyte range starting > at offset 1024k from the beginning of the file. > > Does the right thing happen to the mmap'ed region in memory? Implementation detail. like a hole punch, it needs to invalidate the range that it is operating over so mmap()d regions are refaulted after the operation is done. Cheers, Dave. -- Dave Chinner david@xxxxxxxxxxxxx -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
