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generic: test mmap write vs. hole punching
authorAndreas Gruenbacher <agruenba@redhat.com>
Fri, 6 Sep 2019 16:53:04 +0000 (18:53 +0200)
committerEryu Guan <guaneryu@gmail.com>
Sun, 15 Sep 2019 04:05:18 +0000 (12:05 +0800)
On file systems with a block size smaller than the page size, hole
punching can leave the pages at the beginning and the end of the
hole partially mapped to disk blocks.  Make sure writes to those
pages are handled correctly.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Reviewed-by: Eryu Guan <guaneryu@gmail.com>
Signed-off-by: Eryu Guan <guaneryu@gmail.com>

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