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overlay: add a test for multiple redirects to the same lower dir

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Multiple redirects to the same lower dir will falsely return the
same st_ino/st_dev for two different upper dirs and will cause
'diff' to falsely report that content of directories is the same
when it is not.

This test checks that overalyfs detects and fails lookup of a
multiply redirected dir.

The check for multiply redirected dir was implemented by kernel
commit titled "ovl: hash directory inodes for fsnotify".

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Reviewed-by: Eryu Guan <eguan@redhat.com>
Signed-off-by: Eryu Guan <eguan@redhat.com>
This commit is contained in:
Amir Goldstein
2018-01-28 11:07:30 +02:00
committed by Eryu Guan
parent 2d9c377025
commit 1fa396719e
3 changed files with 112 additions and 0 deletions
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QA output created by 049
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