[Qemu-devel] [PATCH 0/3] drive-mirror: limit niov to MAX_IOV

[John Snow <jsnow@redhat.com>]

e5b43573 caused a regression in the preparation of our IO vectors, such
that if a small granularity but a large buffer size is chosen, we may
accidentally exceed MAX_IOV and the request will fail.

This has been fixed before in cae98cb8, and now we'll fix it again.
To keep it fixed, we'll add an iotest this time.

[Thanks to Max for finding the root cause.]

John Snow (3):
  mirror: clarify mirror_do_read return code
  mirror: limit niov to IOV_MAX elements, again
  iotests: add small-granularity mirror test

 block/mirror.c             | 10 ++++++++--
 tests/qemu-iotests/041     | 30 ++++++++++++++++++++++++++++++
 tests/qemu-iotests/041.out |  4 ++--
 3 files changed, 40 insertions(+), 4 deletions(-)

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2.4.11