v2: Fix typo in commit message. (Eric) Reorder patches as Paolo suggested.
This is the partial work to introduce bdrv_lock / bdrv_unlock and use them in block jobs where exclusive access to a BDS is necessary. It address the same category of problems as [1] with a different API, as the idea proposed by Paolo and Kevin. What's implemented in this series is also very close to [1], i.e. pausing ioeventfd and NBD server, with a notifier list. [1]: https://lists.gnu.org/archive/html/qemu-block/2015-05/msg00800.html Thanks, Fam Zheng (13): block: Use bdrv_drain to replace uncessary bdrv_drain_all block: Introduce bdrv_lock and bdrv_unlock API blockdev: Lock BDS during internal snapshot transaction blockdev: Lock BDS during external snapshot transaction blockdev: Lock BDS during drive-backup transaction blockdev: Lock BDS during blockdev-backup transaction mirror: Protect source between bdrv_drain and bdrv_swap block: Add bdrv_add_lock_unlock_notifier block-backend: Add blk_add_lock_unlock_notifier virtio-blk: Move complete_request to 'ops' structure virtio-blk: Don't handle output when backend is locked virtio-scsi-dataplane: Add backend lock listener nbd-server: Clear "can_read" when backend is locked block.c | 11 ++++-- block/block-backend.c | 6 ++++ block/io.c | 31 ++++++++++++++++ block/mirror.c | 18 ++++++++-- block/snapshot.c | 2 +- blockdev.c | 15 ++++++-- hw/block/dataplane/virtio-blk.c | 36 ++++++++++++++++--- hw/block/virtio-blk.c | 63 +++++++++++++++++++++++++++++++-- hw/scsi/virtio-scsi-dataplane.c | 78 ++++++++++++++++++++++++++++++----------- hw/scsi/virtio-scsi.c | 3 ++ include/block/block.h | 26 ++++++++++++++ include/block/block_int.h | 3 ++ include/hw/virtio/virtio-blk.h | 17 +++++++-- include/hw/virtio/virtio-scsi.h | 3 ++ include/sysemu/block-backend.h | 1 + migration/block.c | 2 +- nbd.c | 21 +++++++++++ 17 files changed, 296 insertions(+), 40 deletions(-) -- 2.4.1