v4: * Add .pause()/.resume() callbacks to really quiesce during block_job_pause_point() [Paolo] * Add AioContext change support for backup block job * Tested drive_mirror + migration and drive_backup + reboot
v3: * Push infrastructure down into blockjob.c so other jobs can reuse it [Stefan] * Tested with drive_mirror + migration [Stefan] v2: * Fam introduced the concept of a synchronous aio_poll() loop to quiesce the block job during detach When dataplane is enabled or disabled the drive switches to a new AioContext. The mirror and backup block jobs must also move to the new AioContext so that drive accesses are always made within its AioContext. This series extends the block job pause functionality so that detaching from an AioContext pauses the job and attaching to the new AioContext resumes the job. Pause points are added to the mirror job so that long I/O loops can yield for an AioContext switch. Other block jobs need pause points too but this can be done as a follow-up series. Stefan Hajnoczi (5): blockjob: move iostatus reset out of block_job_enter() blockjob: add pause points blockjob: add AioContext attached callback mirror: follow AioContext change gracefully backup: follow AioContext change gracefully block/backup.c | 22 ++++++++----- block/mirror.c | 45 +++++++++++++++++++++----- blockdev.c | 1 + blockjob.c | 84 ++++++++++++++++++++++++++++++++++++++++++------ include/block/blockjob.h | 42 ++++++++++++++++++++++-- 5 files changed, 166 insertions(+), 28 deletions(-) -- 2.5.5
