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Paolo Bonzini c9d1a56174 block: only call aio_poll on the current thread's AioContext 
aio_poll is not thread safe; for example bdrv_drain can hang if
the last in-flight I/O operation is completed in the I/O thread after
the main thread has checked bs->in_flight.

The bug remains latent as long as all of it is called within
aio_context_acquire/aio_context_release, but this will change soon.

To fix this, if bdrv_drain is called from outside the I/O thread,
signal the main AioContext through a dummy bottom half.  The event
loop then only runs in the I/O thread.

Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <1477565348-5458-18-git-send-email-pbonzini@redhat.com>
Signed-off-by: Fam Zheng <famz@redhat.com>
2016-10-28 21:50:18 +08:00
..
accounting.c
block: Clean up includes
2016-01-20 13:36:23 +01:00
archipelago.c
block: use aio_bh_schedule_oneshot
2016-10-07 13:34:07 +02:00
backup.c
blockjob: introduce .drain callback for jobs
2016-10-28 21:50:18 +08:00
blkdebug.c
block: use aio_bh_schedule_oneshot
2016-10-07 13:34:07 +02:00
blkreplay.c
replay: allow replay stopping and restarting
2016-09-27 11:57:30 +02:00
blkverify.c
block: use aio_bh_schedule_oneshot
2016-10-07 13:34:07 +02:00
block-backend.c
block: introduce BDRV_POLL_WHILE
2016-10-28 21:50:18 +08:00
bochs.c
block: Convert bdrv_co_preadv/pwritev to BdrvChild
2016-07-05 16:46:27 +02:00
cloop.c
block: Convert bdrv_pread(v) to BdrvChild
2016-07-05 16:46:27 +02:00
commit.c
block: prepare bdrv_reopen_multiple to release AioContext
2016-10-28 21:50:18 +08:00
crypto.c
crypto: make PBKDF iterations configurable for LUKS format
2016-09-19 16:30:45 +01:00
curl.c
block: use aio_bh_schedule_oneshot
2016-10-07 13:34:07 +02:00
dirty-bitmap.c
block: More operations for meta dirty bitmap
2016-10-24 17:56:07 +02:00
dmg-bz2.c
dmg: Move libbz2 code to dmg-bz2.so
2016-10-07 14:14:06 +02:00
dmg.c
dmg: Move libbz2 code to dmg-bz2.so
2016-10-07 14:14:06 +02:00
dmg.h
dmg: Move libbz2 code to dmg-bz2.so
2016-10-07 14:14:06 +02:00
gluster.c
block: use aio_bh_schedule_oneshot
2016-10-07 13:34:07 +02:00
io.c
block: only call aio_poll on the current thread's AioContext
2016-10-28 21:50:18 +08:00
iscsi.c
block/iscsi: Adding new iSER transport layer option
2016-10-24 11:30:55 +02:00
linux-aio.c
linux-aio: fix re-entrant completion processing
2016-09-28 17:11:23 +01:00
Makefile.objs
dmg: Move libbz2 code to dmg-bz2.so
2016-10-07 14:14:06 +02:00
mirror.c
mirror: use bdrv_drained_begin/bdrv_drained_end
2016-10-28 21:50:18 +08:00
nbd-client.c
nbd: Convert to byte-based interface
2016-07-20 14:24:25 +01:00
nbd-client.h
nbd: Limit nbdflags to 16 bits
2016-08-03 18:44:56 +02:00
nbd.c
block/nbd: Use SocketAddress options
2016-10-27 19:05:23 +02:00
nfs.c
block: only call aio_poll on the current thread's AioContext
2016-10-28 21:50:18 +08:00
null.c
block: use aio_bh_schedule_oneshot
2016-10-07 13:34:07 +02:00
parallels.c
block/parallels: check new image size
2016-08-05 09:59:06 +01:00
qapi.c
qapi: rename QmpOutputVisitor to QObjectOutputVisitor
2016-10-25 16:25:54 +02:00
qcow2-cache.c
block: Convert bdrv_pwrite(v/_sync) to BdrvChild
2016-07-05 16:46:27 +02:00
qcow2-cluster.c
qcow2: Support BDRV_REQ_MAY_UNMAP
2016-10-24 17:54:03 +02:00
qcow2-refcount.c
block: Convert bdrv_discard() to byte-based
2016-07-20 14:11:55 +01:00
qcow2-snapshot.c
block: Convert bdrv_pwrite(v/_sync) to BdrvChild
2016-07-05 16:46:27 +02:00
qcow2.c
qcow2: Support BDRV_REQ_MAY_UNMAP
2016-10-24 17:54:03 +02:00
qcow2.h
qcow2: Support BDRV_REQ_MAY_UNMAP
2016-10-24 17:54:03 +02:00
qcow.c
crypto: extend mode as a parameter in qcrypto_cipher_supports()
2016-10-19 10:09:24 +01:00
qed-check.c
qed: Use DIV_ROUND_UP
2016-06-07 18:19:24 +03:00
qed-cluster.c
block: Clean up includes
2016-01-20 13:36:23 +01:00
qed-gencb.c
block: Clean up includes
2016-01-20 13:36:23 +01:00
qed-l2-cache.c
block: Clean up includes
2016-01-20 13:36:23 +01:00
qed-table.c
block: introduce BDRV_POLL_WHILE
2016-10-28 21:50:18 +08:00
qed.c
qed: Implement .bdrv_drain
2016-10-28 21:50:18 +08:00
qed.h
block: use aio_bh_schedule_oneshot
2016-10-07 13:34:07 +02:00
quorum.c
quorum: do not allocate multiple iovecs for FIFO strategy
2016-10-24 17:56:06 +02:00
raw_bsd.c
raw: Implement .bdrv_co_ioctl instead of .bdrv_aio_ioctl
2016-10-27 19:05:23 +02:00
raw-posix.c
raw-posix: Don't use bdrv_ioctl()
2016-10-27 19:05:23 +02:00
raw-win32.c
block: improve error handling in raw_open
2016-10-24 17:54:03 +02:00
rbd.c
rbd: shift byte count as a 64-bit value
2016-10-23 16:10:59 +02:00
replication.c
block: prepare bdrv_reopen_multiple to release AioContext
2016-10-28 21:50:18 +08:00
sheepdog.c
block: only call aio_poll on the current thread's AioContext
2016-10-28 21:50:18 +08:00
snapshot.c
error: Remove NULL checks on error_propagate() calls
2016-06-20 16:38:13 +02:00
ssh.c
block/ssh: Use QemuOpts for runtime options
2016-08-15 15:52:28 +02:00
stream.c
Improve block job rate limiting for small bandwidth values
2016-07-13 13:41:38 +02:00
throttle-groups.c
throttle: Correct access to wrong BlockBackendPublic structures
2016-10-24 17:54:03 +02:00
trace-events
block: Remove bdrv_aio_pdiscard()
2016-10-27 19:05:22 +02:00
vdi.c
vdi: Use QEMU UUID API
2016-09-23 11:42:52 +08:00
vhdx-endian.c
vhdx: Use QEMU UUID API
2016-09-23 11:42:52 +08:00
vhdx-log.c
block: Convert bdrv_pwrite(v/_sync) to BdrvChild
2016-07-05 16:46:27 +02:00
vhdx.c
vhdx: Use QEMU UUID API
2016-09-23 11:42:52 +08:00
vhdx.h
…
vmdk.c
vmdk: add vmdk_co_pwritev_compressed
2016-09-05 19:06:48 +02:00
vpc.c
vpc: Use QEMU UUID API
2016-09-23 11:42:52 +08:00
vvfat.c
block: Add "read-only" to the options QDict
2016-09-23 13:36:10 +02:00
win32-aio.c
linux-aio: share one LinuxAioState within an AioContext
2016-07-18 15:09:31 +01:00
write-threshold.c
block: use bdrv_add_before_write_notifier
2016-10-07 13:34:07 +02:00