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Add internal scsi generic block API (Avi Kivity)

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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 <avi@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6823 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
aliguori 2009-03-12 19:57:12 +00:00
parent 7d78066926
commit 04eeb8b6d6
3 changed files with 44 additions and 4 deletions
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30
block-raw-posix.c
View File

@ -1179,6 +1179,32 @@ 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 = {
.format_name = "host_device",
.instance_size = sizeof(BDRVRawState),
@ -1204,4 +1230,8 @@ 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,
};

8
block.c
View File

@ -1678,22 +1678,22 @@ 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);
}

10
block_int.h
View File

@ -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;