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btrfs: test for incremental send after file extent cloning

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Test that an incremental send works after a file gets one of its extents
cloned/deduplicated into lower file offsets.

This is a regression test for the problem fixed by the linux kernel patch
titled:

  "Btrfs: teach backref walking about backrefs with underflowed
   offset values"

Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Filipe Manana
2015-08-04 14:10:49 +10:00
committed by Dave Chinner
parent 5da2519817
commit 45eca98065
3 changed files with 121 additions and 0 deletions
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tests/btrfs/097.out
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QA output created by 097
wrote 65536/65536 bytes at offset 131072
XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
File digest in the original filesystem:
6c6079335cff141b8a31233ead04cbff SCRATCH_MNT/mysnap2/foo
File digest in the new filesystem:
6c6079335cff141b8a31233ead04cbff SCRATCH_MNT/mysnap2/foo