* Re: [Qemu-devel] support for non aio host os's?
2007-03-16 21:31 [Qemu-devel] support for non aio host os's? Todd T. Fries
@ 2007-03-16 23:38 ` Enache Adrian
0 siblings, 0 replies; 2+ messages in thread
From: Enache Adrian @ 2007-03-16 23:38 UTC (permalink / raw)
To: todd, qemu-devel
On Fri, Mar 16, 2007 at 04:31:36PM -0500, Todd T. Fries wrote:
> .. so now that aio is in, and whatever existed before is out, has anybody
> come up with a way to support host os's that do not have aio?
This is what I'm using.
Just manage to have '#define CONFIG_NO_AIO 1' in ./config-host.h.
Patch is against qemu-cvs, and also includes a raw_getlength()
function that works with disk devices on OpenBSD.
Adi
--- /home/src/qemu/block-raw.c Sat Jan 20 14:10:33 2007
+++ ./block-raw.c Sat Mar 17 01:34:36 2007
@@ -25,7 +25,10 @@
#include "block_int.h"
#include <assert.h>
#ifndef _WIN32
+
+#ifndef CONFIG_NO_AIO
#include <aio.h>
+#endif
#ifndef QEMU_TOOL
#include "exec-all.h"
@@ -57,6 +60,13 @@
#include <sys/disk.h>
#endif
+#ifdef __OpenBSD__
+#include <sys/ioctl.h>
+#include <sys/disklabel.h>
+#include <sys/dkio.h>
+#endif
+
+
//#define DEBUG_FLOPPY
#define FTYPE_FILE 0
@@ -158,6 +168,7 @@ static int raw_pwrite(BlockDriverState *
}
/***********************************************************/
+#ifndef CONFIG_NO_AIO
/* Unix AIO using POSIX AIO */
typedef struct RawAIOCB {
@@ -380,6 +391,37 @@ static void raw_aio_cancel(BlockDriverAI
}
}
+#else /* !CONFIG_NO_AIO */
+
+void qemu_aio_init(void)
+{
+}
+
+void qemu_aio_poll(void)
+{
+}
+
+void qemu_aio_flush(void)
+{
+}
+
+void qemu_aio_wait_start(void)
+{
+}
+
+void qemu_aio_wait(void)
+{
+#ifndef QEMU_TOOL
+ qemu_bh_poll();
+#endif
+}
+
+void qemu_aio_wait_end(void)
+{
+}
+
+#endif /* !CONFIG_NO_AIO */
+
static void raw_close(BlockDriverState *bs)
{
BDRVRawState *s = bs->opaque;
@@ -399,8 +441,28 @@ static int raw_truncate(BlockDriverState
return 0;
}
+#ifdef __OpenBSD__
+
static int64_t raw_getlength(BlockDriverState *bs)
{
+ int fd = ((BDRVRawState*)bs->opaque)->fd;
+ struct stat st;
+ if(fstat(fd, &st))
+ return -1;
+ if(S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode)){
+ struct disklabel dl;
+ if(ioctl(fd, DIOCGDINFO, &dl))
+ return -1;
+ return (int64_t)dl.d_secsize *
+ dl.d_partitions[DISKPART(st.st_rdev)].p_size;
+ }else
+ return st.st_size;
+}
+
+#else /* !__OpenBSD__ */
+
+static int64_t raw_getlength(BlockDriverState *bs)
+{
BDRVRawState *s = bs->opaque;
int fd = s->fd;
int64_t size;
@@ -446,6 +508,8 @@ static int64_t raw_getlength(BlockDrive
return size;
}
+#endif /* !__OpenBSD__ */
+
static int raw_create(const char *filename, int64_t total_size,
const char *backing_file, int flags)
{
@@ -480,10 +544,12 @@ BlockDriver bdrv_raw = {
raw_create,
raw_flush,
+#ifndef CONFIG_NO_AIO
.bdrv_aio_read = raw_aio_read,
.bdrv_aio_write = raw_aio_write,
.bdrv_aio_cancel = raw_aio_cancel,
.aiocb_size = sizeof(RawAIOCB),
+#endif /* !CONFIG_NO_AIO */
.protocol_name = "file",
.bdrv_pread = raw_pread,
.bdrv_pwrite = raw_pwrite,
@@ -816,10 +882,12 @@ BlockDriver bdrv_host_device = {
NULL,
raw_flush,
+#ifndef CONFIG_NO_AIO
.bdrv_aio_read = raw_aio_read,
.bdrv_aio_write = raw_aio_write,
.bdrv_aio_cancel = raw_aio_cancel,
.aiocb_size = sizeof(RawAIOCB),
+#endif /* !CONFIG_NO_AIO */
.bdrv_pread = raw_pread,
.bdrv_pwrite = raw_pwrite,
.bdrv_getlength = raw_getlength,
^ permalink raw reply [flat|nested] 2+ messages in thread