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authorFrediano Ziglio <freddy77@gmail.com>2011-08-30 09:46:11 +0200
committerKevin Wolf <kwolf@redhat.com>2011-09-06 11:23:51 +0200
commitc30e624d5d04efdb581c841f9bf8b06302b96575 (patch)
treec8d52ebaac8687324a86a368a2076623f5ee7fc4 /block
parentf69539b14bdba7a5cd22e1f4bed439b476b17286 (diff)
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linux aio: some comments
Add some notes about Linux AIO explaining why we don't use AIO in some situations. Signed-off-by: Frediano Ziglio <freddy77@gmail.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'block')
-rw-r--r--block/raw-posix.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/block/raw-posix.c b/block/raw-posix.c
index c5c9944..bcf50b2 100644
--- a/block/raw-posix.c
+++ b/block/raw-posix.c
@@ -236,6 +236,10 @@ static int raw_open_common(BlockDriverState *bs, const char *filename,
}
#ifdef CONFIG_LINUX_AIO
+ /*
+ * Currently Linux do AIO only for files opened with O_DIRECT
+ * specified so check NOCACHE flag too
+ */
if ((bdrv_flags & (BDRV_O_NOCACHE|BDRV_O_NATIVE_AIO)) ==
(BDRV_O_NOCACHE|BDRV_O_NATIVE_AIO)) {