Tests with xfstests
===================

The xfstests test suite has been run on the original
and modified kernels -- on all cache modes available
(writethrough, writeback, writearound, none).

Summary: no regressions observed; apparently one FIX
achieved in the writearound cache mode (generic/371).

(attached script: 'test-bcache-cache-modes.sh')

Details:
-------

The bcache device is made of
- caching device: 1 GB partition in NVMe drive  
- backing device: 5 GB partition in SCSI disk

ubuntu@buneary:~/xfstests-dev$ git log --oneline -1
f769a923 (HEAD -> master, origin/master, origin/HEAD) xfs: project quota 
ineritance flag test

The comparison of the output of xfstests/check script
for the 'Failures' with original (orig) and modified
(test) test kernels is provided below.

# grep ^Failures: xfstests.*/xfstests.*.*.log | sed 's,/, ,' | sort -k 2,2 -k 
1,1
xfstests.orig xfstests.test.none.log:Failures: ext4/032 generic/484 generic/491 
generic/504 generic/537
xfstests.test xfstests.test.none.log:Failures: ext4/032 generic/484 generic/491 
generic/504 generic/537
xfstests.orig xfstests.test.writearound.log:Failures: ext4/032 generic/371 
generic/451 generic/484 generic/491 generic/504 generic/537
xfstests.test xfstests.test.writearound.log:Failures: ext4/032 <.........> 
generic/451 generic/484 generic/491 generic/504 generic/537
xfstests.orig xfstests.test.writeback.log:Failures: generic/484 generic/491 
generic/504 generic/537
xfstests.test xfstests.test.writeback.log:Failures: generic/484 generic/491 
generic/504 generic/537
xfstests.orig xfstests.test.writethrough.log:Failures: ext4/032 generic/484 
generic/491 generic/504 generic/537
xfstests.test xfstests.test.writethrough.log:Failures: ext4/032 generic/484 
generic/491 generic/504 generic/537

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https://bugs.launchpad.net/bugs/1829563

Title:
  bcache: risk of data loss on I/O errors in backing or caching devices

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