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authorNishanth Aravamudan <naravamudan@digitalocean.com>2018-06-22 12:37:00 -0700
committerStefan Hajnoczi <stefanha@redhat.com>2018-06-27 13:06:34 +0100
commited6e2161715c527330f936d44af4c547f25f687e (patch)
tree691d9a8ffcf3b7b6fe520ad7c2e2b65b2bb67855 /include/block/aio.h
parentf18793b096e69c7acfce66cded483ba9fc01762a (diff)
downloadqemu-arm-ed6e2161715c527330f936d44af4c547f25f687e.tar.gz
linux-aio: properly bubble up errors from initialization
laio_init() can fail for a couple of reasons, which will lead to a NULL pointer dereference in laio_attach_aio_context(). To solve this, add a aio_setup_linux_aio() function which is called early in raw_open_common. If this fails, propagate the error up. The signature of aio_get_linux_aio() was not modified, because it seems preferable to return the actual errno from the possible failing initialization calls. Additionally, when the AioContext changes, we need to associate a LinuxAioState with the new AioContext. Use the bdrv_attach_aio_context callback and call the new aio_setup_linux_aio(), which will allocate a new AioContext if needed, and return errors on failures. If it fails for any reason, fallback to threaded AIO with an error message, as the device is already in-use by the guest. Add an assert that aio_get_linux_aio() cannot return NULL. Signed-off-by: Nishanth Aravamudan <naravamudan@digitalocean.com> Message-id: 20180622193700.6523-1-naravamudan@digitalocean.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Diffstat (limited to 'include/block/aio.h')
-rw-r--r--include/block/aio.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/block/aio.h b/include/block/aio.h
index ae6f354e6c..f08630c6e5 100644
--- a/include/block/aio.h
+++ b/include/block/aio.h
@@ -381,6 +381,9 @@ GSource *aio_get_g_source(AioContext *ctx);
/* Return the ThreadPool bound to this AioContext */
struct ThreadPool *aio_get_thread_pool(AioContext *ctx);
+/* Setup the LinuxAioState bound to this AioContext */
+struct LinuxAioState *aio_setup_linux_aio(AioContext *ctx, Error **errp);
+
/* Return the LinuxAioState bound to this AioContext */
struct LinuxAioState *aio_get_linux_aio(AioContext *ctx);