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# Date Author Comment
c53a7285 05/21/2010 12:49 pm Avi Kivity

block: fix aio_flush segfaults for read-only protocols (e.g. curl)

Not all block format drivers expose an io_flush method (reasonable for
read-only protocols), so calling io_flush there will immediately segfault.

Fix by checking for the method's existence before calling it....
8febfa26 10/27/2009 07:28 pm Kevin Wolf

Add qemu_aio_process_queue()

We'll leave some AIO completions unhandled when we can't call the callback.
qemu_aio_process_queue() is used later to run any callbacks that are left and
can be run then.

Signed-off-by: Kevin Wolf <>
Signed-off-by: Anthony Liguori <>
72cf2d4f 09/12/2009 10:36 am Blue Swirl

Fix sys-queue.h conflict for good

Problem: Our file sys-queue.h is a copy of the BSD file, but there are
some additions and it's not entirely compatible. Because of that, there have
been conflicts with system headers on BSD systems. Some hacks have been
introduced in the commits 15cc9235840a22c289edbe064a9b3c19c5f49896,...
6e5d97d0 07/22/2009 06:58 pm Nolan

Handle BH's queued by AIO completions in qemu_aio_flush()

Without this, the call to qemu_aio_flush during migration doesn't
actually flush all in-flight SCSI IOs.

Signed-off-by: Nolan Leake <nolan <at> sigbus.net>
Signed-off-by: Anthony Liguori <>
986c28d6 06/15/2009 02:52 pm Andrea Arcangeli

fix qemu_aio_flush

qemu_aio_wait by invoking the bh or one of the aio completion
callbacks, could end up submitting new pending aio, breaking the
invariant that qemu_aio_flush returns only when no pending aio is
outstanding (possibly a problem for migration as such)....
79d5ca56 05/08/2009 11:24 pm Alexander Graf

AIO deletion race fix

When deleting an fd event there is a chance the object doesn't get
deleted, but only ->deleted set positive and deleted somewhere later.

Now, if we create a handler for the fd again before the actual
deletion occurs, we end up writing data into an object that has...
1eec614b 02/06/2009 12:06 am aliguori

toplevel: remove error handling from qemu_malloc() callers (Avi Kivity)

Signed-off-by: Avi Kivity <>
Signed-off-by: Anthony Liguori <>

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6531 c046a42c-6fe2-441c-8c8c-71466251a162
f71903d0 10/13/2008 12:19 am aliguori

Make sure to initialize fd_sets in aio.c

This was spotted by valgrind.

Signed-off-by: Anthony Liguori <>

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5470 c046a42c-6fe2-441c-8c8c-71466251a162
a76bab49 09/22/2008 10:17 pm aliguori

Refactor AIO to allow multiple AIO implementations

This patch refactors the AIO layer to allow multiple AIO implementations. It's
only possible because of the recent signalfd() patch.

Right now, the AIO infrastructure is pretty specific to the block raw backend....