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(-) -- 2.4.11
