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-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 c5c99446c0..bcf50b2cf7 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)) {