Re: [PATCH 1/3] fs: Introduce new flag FALLOC_FL_COLLAPSE_RANGE

From: Theodore Ts'o
Date: Wed Jul 31 2013 - 18:25:06 EST

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?


- Ted
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