The test currently fails on filesystems with a block size greater
than 4Kb, as dedupe operations fail with -EINVAL because the file
offsets used are not multiples of such block sizes (but they are
multiples of 4Kb, 2Kb and 1Kb).
So update the test to use offsets that are multiples of 64Kb, since
that allows the test to work on filesystems with any block size
between 4Kb and 64Kb (8Kb, 16Kb, 32Kb). Verified it works as
expected on kernels that have the fixes for the issue tested by this
test case (listed in the changelog of commit
91540ef980), and on systems without
those fixes (a 4.18 kernel), it fails as it is supposed to.
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: Eryu Guan <guaneryu@gmail.com>
Signed-off-by: Eryu Guan <guaneryu@gmail.com>
Test that deduplication of an entire file that has a size that is not
aligned to the filesystem's block size into the middle of a different
file does not corrupt the destination's file data by reflinking the last
(eof) block.
This test is motivated by a bug recently found that affects both Btrfs
and XFS, and is fixed by the following commits/patches for the linux
kernel:
07d19dc9fbe9 ("vfs: avoid problematic remapping requests into partial EOF block")
dceeb47b0ed6 ("xfs: fix data corruption w/ unaligned dedupe ranges")
de02b9f6bb65 ("Btrfs: fix data corruption when deduplicating between different files")
Btrfs: fix infinite loop on inode eviction after deduplication of eof block
The VFS patch was added to kernel 4.20-rc1 and the XFS and first Btrfs
patches were added to kernel 4.19. The second patch for Btrfs is very
recent and it is not yet in Linus' tree.
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: Eryu Guan <guaneryu@gmail.com>
Signed-off-by: Eryu Guan <guaneryu@gmail.com>
Filipe Manana