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authoraliguori <aliguori@c046a42c-6fe2-441c-8c8c-71466251a162>2009-03-12 19:57:08 +0000
committeraliguori <aliguori@c046a42c-6fe2-441c-8c8c-71466251a162>2009-03-12 19:57:08 +0000
commit7d78066926b68afe28a1948c64618ee085d9ab02 (patch)
tree8a29ece82d1a77db49c8679502641eb2f6b9079c /block.h
parent943984c7a508a2d76029e8065b2c2564d279892f (diff)
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Add specialized block driver scsi generic API (Avi Kivity)
When a scsi device is backed by a scsi generic device instead of an ordinary host block device, the block API is abused in a couple of annoying ways: - nb_sectors is negative, and specifies a byte count instead of a sector count - offset is ignored, since scsi-generic is essentially a packet protocol This overloading makes hacking the block layer difficult. Remove it by introducing a new explicit API for scsi-generic devices. The new API is still backed by the old implementation, but at least the users are insulated. 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@6822 c046a42c-6fe2-441c-8c8c-71466251a162
Diffstat (limited to 'block.h')
-rw-r--r--block.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/block.h b/block.h
index f6b14ee..b0c63ac 100644
--- a/block.h
+++ b/block.h
@@ -101,6 +101,14 @@ BlockDriverAIOCB *bdrv_aio_write(BlockDriverState *bs, int64_t sector_num,
BlockDriverCompletionFunc *cb, void *opaque);
void bdrv_aio_cancel(BlockDriverAIOCB *acb);
+/* sg packet commands */
+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);
+
/* Ensure contents are flushed to disk. */
void bdrv_flush(BlockDriverState *bs);
void bdrv_flush_all(void);