[sheepdog] [PATCH v4 00/10] sheepdog: reconnect server after connection failure

[MORITA Kazutaka]

Currently, if a sheepdog server exits, all the connecting VMs need to
be restarted.  This series implements a feature to reconnect the
server, and enables us to do online sheepdog upgrade and avoid
restarting VMs when sheepdog servers crash unexpectedly.

v4:
 - Added comment to explain why we need a failed queue.
 - Fixed a return value of sd_acb_cancelable().

v3:
 - Check return values of qemu_co_recv/send more strictly.
 - Move inflight requests to the failed list after reconnection
   completes.  This is necessary to resend I/Os while connection is
   lost.
 - Check simultaneous create in resend_aioreq().

v2:
 - Dropped nonblocking connect patches.

MORITA Kazutaka (10):
  ignore SIGPIPE in qemu-img and qemu-io
  iov: handle EOF in iov_send_recv
  sheepdog: check return values of qemu_co_recv/send correctly
  sheepdog: handle vdi objects in resend_aio_req
  sheepdog: reload inode outside of resend_aioreq
  coroutine: add co_aio_sleep_ns() to allow sleep in block drivers
  sheepdog: try to reconnect to sheepdog after network error
  sheepdog: make add_aio_request and send_aioreq void functions
  sheepdog: cancel aio requests if possible
  sheepdog: check simultaneous create in resend_aioreq

 block/sheepdog.c          | 320 +++++++++++++++++++++++++++++-----------------
 include/block/coroutine.h |   8 ++
 qemu-coroutine-sleep.c    |  47 +++++++
 qemu-img.c                |   4 +
 qemu-io.c                 |   4 +
 util/iov.c                |   6 +
 6 files changed, 269 insertions(+), 120 deletions(-)

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1.8.1.3.566.gaa39828