Messages in this thread | | | Date | Thu, 1 Aug 2013 10:23:41 +1000 | From | Dave Chinner <> | Subject | Re: [PATCH 1/3] fs: Introduce new flag FALLOC_FL_COLLAPSE_RANGE |
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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@fromorbit.com
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