This adds a regression test for the following series:
[PATCH v4 0/2] ext4: fix DAX dma vs truncate/hole-punch
https://lists.01.org/pipermail/linux-nvdimm/2018-July/016842.html
which adds synchronization between DAX DMA in ext4 and truncate/hole-punch.
The intention of the test is to test those specific changes, but it runs
fine both with XFS and without DAX so I've put it in the generic tests
instead of ext4 and not restricted it to only DAX configurations.
When run with v4.18-rc6 + DAX + ext4, this test will hit the following
WARN_ON_ONCE() in dax_disassociate_entry():
WARN_ON_ONCE(trunc && page_ref_count(page) > 1);
If you change this to a WARN_ON() instead, you can see that each of the
four paths being exercised in this test hits that condition many times in
the one second that the subtest is being run.
Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Reviewed-by: Eryu Guan <guaneryu@gmail.com>
Signed-off-by: Eryu Guan <guaneryu@gmail.com>
Tests were merged with high seq numbers to avoid conflicts with
other tests. Now renumber them to contiguous numbers, as all other
tests have been merged correctly. This is easier to do than
assigning the final seq numbers at commit time.
Signed-off-by: Eryu Guan <eguan@redhat.com>
The following error are reported after running this test:
*** xfs_check output ***
leftover CoW extent (0/2147483736) len 1
block 0/2147483736 out of range
blocks 0/2147483736..2147483736 claimed by block 0/6
leftover CoW extent (0/2147483738) len 2
blocks 0/2147483738..2147483739 out of range
blocks 0/2147483738..2147483739 claimed by block 0/6
leftover CoW extent (0/2147483741) len 3
blocks 0/2147483741..2147483743 out of range
blocks 0/2147483741..2147483743 claimed by block 0/6
block 0/88 type unknown not expected
block 0/90 type unknown not expected
block 0/91 type unknown not expected
block 0/93 type unknown not expected
block 0/94 type unknown not expected
block 0/95 type unknown not expected
*** xfs_repair -n output ***
Phase 1 - find and verify superblock...
Phase 2 - using internal log
- zero log...
- scan filesystem freespace and inode maps...
leftover CoW extent (0/88) len 1
leftover CoW extent (0/90) len 2
leftover CoW extent (0/93) len 3
- found root inode chunk
This should be fixed by patch titled:
xfs: evict CoW fork extents when performing finsert/fcollapse
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Reviewed-by: Eryu Guan <eguan@redhat.com>
Signed-off-by: Eryu Guan <eguan@redhat.com>
Ross Zwisler
Eryu Guan
Amir Goldstein