Samuel Thibault
2008-Jun-05 10:56 UTC
[Xen-devel] [PATCH] minios: add a blkfront synchronous interface
minios: add a blkfront synchronous interface
Signed-off-by: Samuel Thibault <samuel.thibault@eu.citrix.com>
diff -r 5603534c62f9 extras/mini-os/blkfront.c
--- a/extras/mini-os/blkfront.c Tue Jun 03 09:41:19 2008 +0100
+++ b/extras/mini-os/blkfront.c Thu Jun 05 11:53:58 2008 +0100
@@ -323,14 +323,33 @@
if(notify) notify_remote_via_evtchn(dev->evtchn);
}
-void blkfront_aio_write(struct blkfront_aiocb *aiocbp)
+static void blkfront_aio_cb(struct blkfront_aiocb *aiocbp, int ret)
{
- blkfront_aio(aiocbp, 1);
+ aiocbp->data = (void*) 1;
}
-void blkfront_aio_read(struct blkfront_aiocb *aiocbp)
+void blkfront_io(struct blkfront_aiocb *aiocbp, int write)
{
- blkfront_aio(aiocbp, 0);
+ unsigned long flags;
+ ASSERT(!aiocbp->aio_cb);
+ aiocbp->aio_cb = blkfront_aio_cb;
+ blkfront_aio(aiocbp, write);
+ aiocbp->data = NULL;
+
+ local_irq_save(flags);
+ DEFINE_WAIT(w);
+ while (1) {
+ blkfront_aio_poll(aiocbp->aio_dev);
+ if (aiocbp->data)
+ break;
+
+ add_waiter(w, blkfront_queue);
+ local_irq_restore(flags);
+ schedule();
+ local_irq_save(flags);
+ }
+ remove_waiter(w);
+ local_irq_restore(flags);
}
static void blkfront_push_operation(struct blkfront_dev *dev, uint8_t op,
uint64_t id)
--- a/extras/mini-os/include/blkfront.h Tue Jun 03 09:41:19 2008 +0100
+++ b/extras/mini-os/include/blkfront.h Thu Jun 05 11:53:58 2008 +0100
@@ -29,8 +29,11 @@
int blkfront_open(struct blkfront_dev *dev);
#endif
void blkfront_aio(struct blkfront_aiocb *aiocbp, int write);
-void blkfront_aio_read(struct blkfront_aiocb *aiocbp);
-void blkfront_aio_write(struct blkfront_aiocb *aiocbp);
+#define blkfront_aio_read(aiocbp) blkfront_aio(aiocbp, 0)
+#define blkfront_aio_write(aiocbp) blkfront_aio(aiocbp, 1)
+void blkfront_io(struct blkfront_aiocb *aiocbp, int write);
+#define blkfront_read(aiocbp) blkfront_io(aiocbp, 0)
+#define blkfront_write(aiocbp) blkfront_io(aiocbp, 1)
void blkfront_aio_push_operation(struct blkfront_aiocb *aiocbp, uint8_t op);
int blkfront_aio_poll(struct blkfront_dev *dev);
void blkfront_sync(struct blkfront_dev *dev);
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