Only build compatfd when using AIO and make sure to always init AIO

OpenBSD doesn't use AIO so don't try to build compatfd when not using AIO.

Also make sure to call qemu_aio_init() from bdrv_init.  Everything that uses
bdrv calls bdrv_init so it makes sense to init aio from there instead of
in every single tool.
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>



git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5197 c046a42c-6fe2-441c-8c8c-71466251a162

Makefile

@@ -177,7 +177,11 @@ QEMU_IMG_BLOCK_OBJS = $(BLOCK_OBJS)
 ifdef CONFIG_WIN32
 QEMU_IMG_BLOCK_OBJS += qemu-img-block-raw-win32.o
 else
-QEMU_IMG_BLOCK_OBJS += nbd.o qemu-img-block-raw-posix.o compatfd.o
+QEMU_IMG_BLOCK_OBJS += nbd.o qemu-img-block-raw-posix.o
+endif
+
+ifdef CONFIG_AIO
+QEMU_IMG_BLOCK_OBJS += compatfd.o
 endif
 
 ######################################################################

Makefile.target

@@ -476,7 +476,11 @@ OBJS=vl.o osdep.o monitor.o pci.o loader.o isa_mmio.o machine.o net-checksum.o
 ifdef CONFIG_WIN32
 OBJS+=block-raw-win32.o
 else
-OBJS+=block-raw-posix.o compatfd.o
+OBJS+=block-raw-posix.o
+endif
+
+ifdef CONFIG_AIO
+OBJS+=compatfd.o
 endif
 
 LIBS+=-lz

block-raw-posix.c

@@ -561,6 +561,9 @@ void qemu_aio_wait(void)
         return;
 #endif
 
+    if (!first_aio)
+        return;
+
     do {
         fd_set rdfds;
 

block.c

@@ -1328,6 +1328,8 @@ void bdrv_init(void)
 #ifndef _WIN32
     bdrv_register(&bdrv_nbd);
 #endif
+
+    qemu_aio_init();
 }
 
 void *qemu_aio_get(BlockDriverState *bs, BlockDriverCompletionFunc *cb,

configure

@@ -1220,6 +1220,7 @@ if test "$brlapi" = "yes" ; then
 fi
 if test "$aio" = "yes" ; then
   echo "#define CONFIG_AIO 1" >> $config_h
+  echo "CONFIG_AIO=yes" >> $config_mak
 fi
 
 # XXX: suppress that