During nbd_send_negotiate, if the client simply doesn't respond, the function will not return, and the whole event loop is blocked.
Make the I/O effectively asynchronous by using coroutine read/write, so that a malicious or disappeared client cannot make a hang. Fam Fam Zheng (2): nbd: Interface tweak of nbd_client_new nbd: Coroutine based nbd_send_negotiate blockdev-nbd.c | 5 ++- include/block/nbd.h | 6 ++-- nbd.c | 87 ++++++++++++++++++++++++++++++++++++++++------------- qemu-nbd.c | 16 +++++----- 4 files changed, 81 insertions(+), 33 deletions(-) -- 2.4.3
