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xfstests 240: test non-aligned AIO hole-filling

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This replicates file corruption we've seen with qemu-kvm when
we use if=virtio,cache=none,aio=native for IO to a sparse
ext4- or xfs-hosted file, and the partitions/filesystems
within that file image are not block-aligned.  (think sector
63 here...)  This results in AIO IOs not aligned to the
filesystem blocks.

This test modifies aiodio_sparse2.c to add an option to start
the file IO at an offset.

When we do 4k writes to a 16k file in 2 threads, starting
at offset 512, we get 0s interspersed in the file where they
should not be:

00000000  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
*
00000200  01 01 01 01 01 01 01 01  01 01 01 01 01 01 01 01  |................|
*
00001000  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
*
00001200  01 01 01 01 01 01 01 01  01 01 01 01 01 01 01 01  |................|
....

Signed-off-by: Eric Sandeen <sandeen@sandeen.net>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
This commit is contained in:
Eric Sandeen
2010-07-23 11:18:59 -05:00
parent 034110b37d
commit b05ae2d653
4 changed files with 80 additions and 7 deletions
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@@ -353,3 +353,4 @@ deprecated
237 auto quick acl
238 auto quick metadata ioctl
239 auto aio rw
240 auto aio quick rw