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[Qemu-devel] [PATCH 2/3] Add internal scsi generic block API
From: |
Avi Kivity |
Subject: |
[Qemu-devel] [PATCH 2/3] Add internal scsi generic block API |
Date: |
Sun, 8 Feb 2009 19:59:06 +0200 |
Add an internal API for the generic block layer to send scsi generic commands
to block format driver. This means block format drivers no longer need
to consider overloaded nb_sectors parameters.
Signed-off-by: Avi Kivity <address@hidden>
---
block-raw-posix.c | 30 ++++++++++++++++++++++++++++++
block.c | 8 ++++----
block_int.h | 10 ++++++++++
3 files changed, 44 insertions(+), 4 deletions(-)
diff --git a/block-raw-posix.c b/block-raw-posix.c
index 620791b..6b8adc4 100644
--- a/block-raw-posix.c
+++ b/block-raw-posix.c
@@ -1164,6 +1164,32 @@ static int raw_ioctl(BlockDriverState *bs, unsigned long
int req, void *buf)
}
#endif /* !linux */
+static int raw_sg_send_command(BlockDriverState *bs, void *buf, int count)
+{
+ return raw_pwrite(bs, -1, buf, count);
+}
+
+static int raw_sg_recv_response(BlockDriverState *bs, void *buf, int count)
+{
+ return raw_pread(bs, -1, buf, count);
+}
+
+static BlockDriverAIOCB *raw_sg_aio_read(BlockDriverState *bs,
+ void *buf, int count,
+ BlockDriverCompletionFunc *cb,
+ void *opaque)
+{
+ return raw_aio_read(bs, 0, buf, -(int64_t)count, cb, opaque);
+}
+
+static BlockDriverAIOCB *raw_sg_aio_write(BlockDriverState *bs,
+ void *buf, int count,
+ BlockDriverCompletionFunc *cb,
+ void *opaque)
+{
+ return raw_aio_write(bs, 0, buf, -(int64_t)count, cb, opaque);
+}
+
BlockDriver bdrv_host_device = {
"host_device",
sizeof(BDRVRawState),
@@ -1193,4 +1219,8 @@ BlockDriver bdrv_host_device = {
.bdrv_set_locked = raw_set_locked,
/* generic scsi device */
.bdrv_ioctl = raw_ioctl,
+ .bdrv_sg_send_command = raw_sg_send_command,
+ .bdrv_sg_recv_response = raw_sg_recv_response,
+ .bdrv_sg_aio_read = raw_sg_aio_read,
+ .bdrv_sg_aio_write = raw_sg_aio_write,
};
diff --git a/block.c b/block.c
index 774ac2d..4aaea09 100644
--- a/block.c
+++ b/block.c
@@ -1597,22 +1597,22 @@ int bdrv_ioctl(BlockDriverState *bs, unsigned long int
req, void *buf)
int bdrv_sg_send_command(BlockDriverState *bs, void *buf, int count)
{
- return bdrv_pwrite(bs, -1, buf, count);
+ return bs->drv->bdrv_sg_send_command(bs, buf, count);
}
int bdrv_sg_recv_response(BlockDriverState *bs, void *buf, int count)
{
- return bdrv_pread(bs, -1, buf, count);
+ return bs->drv->bdrv_sg_recv_response(bs, buf, count);
}
BlockDriverAIOCB *bdrv_sg_aio_read(BlockDriverState *bs, void *buf, int count,
BlockDriverCompletionFunc *cb, void *opaque)
{
- return bdrv_aio_read(bs, 0, buf, -(int64_t)count, cb, opaque);
+ return bs->drv->bdrv_sg_aio_read(bs, buf, count, cb, opaque);
}
BlockDriverAIOCB *bdrv_sg_aio_write(BlockDriverState *bs, void *buf, int count,
BlockDriverCompletionFunc *cb, void
*opaque)
{
- return bdrv_aio_write(bs, 0, buf, -(int64_t)count, cb, opaque);
+ return bs->drv->bdrv_sg_aio_write(bs, buf, count, cb, opaque);
}
diff --git a/block_int.h b/block_int.h
index e83fd2c..e4630f0 100644
--- a/block_int.h
+++ b/block_int.h
@@ -84,6 +84,16 @@ struct BlockDriver {
/* to control generic scsi devices */
int (*bdrv_ioctl)(BlockDriverState *bs, unsigned long int req, void *buf);
+ int (*bdrv_sg_send_command)(BlockDriverState *bs, void *buf, int count);
+ int (*bdrv_sg_recv_response)(BlockDriverState *bs, void *buf, int count);
+ BlockDriverAIOCB *(*bdrv_sg_aio_read)(BlockDriverState *bs,
+ void *buf, int count,
+ BlockDriverCompletionFunc *cb,
+ void *opaque);
+ BlockDriverAIOCB *(*bdrv_sg_aio_write)(BlockDriverState *bs,
+ void *buf, int count,
+ BlockDriverCompletionFunc *cb,
+ void *opaque);
BlockDriverAIOCB *free_aiocb;
struct BlockDriver *next;
--
1.6.1.1