block: Lift more functions into BlockBackend

There are already some blk_aio_* functions, so we might as well have
blk_co_* functions (as far as we need them). This patch adds
blk_co_flush(), blk_co_discard(), and also blk_invalidate_cache() (which
is not a blk_co_* function but is needed nonetheless).

Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Message-id: 1416309679-333-2-git-send-email-mreitz@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

block/block-backend.c

@@ -497,6 +497,16 @@ BlockAIOCB *blk_aio_ioctl(BlockBackend *blk, unsigned long int req, void *buf,
     return bdrv_aio_ioctl(blk->bs, req, buf, cb, opaque);
 }
 
+int blk_co_discard(BlockBackend *blk, int64_t sector_num, int nb_sectors)
+{
+    return bdrv_co_discard(blk->bs, sector_num, nb_sectors);
+}
+
+int blk_co_flush(BlockBackend *blk)
+{
+    return bdrv_co_flush(blk->bs);
+}
+
 int blk_flush(BlockBackend *blk)
 {
     return bdrv_flush(blk->bs);
@@ -549,6 +559,11 @@ void blk_set_enable_write_cache(BlockBackend *blk, bool wce)
     bdrv_set_enable_write_cache(blk->bs, wce);
 }
 
+void blk_invalidate_cache(BlockBackend *blk, Error **errp)
+{
+    bdrv_invalidate_cache(blk->bs, errp);
+}
+
 int blk_is_inserted(BlockBackend *blk)
 {
     return bdrv_is_inserted(blk->bs);

include/sysemu/block-backend.h

@@ -108,6 +108,8 @@ int blk_aio_multiwrite(BlockBackend *blk, BlockRequest *reqs, int num_reqs);
 int blk_ioctl(BlockBackend *blk, unsigned long int req, void *buf);
 BlockAIOCB *blk_aio_ioctl(BlockBackend *blk, unsigned long int req, void *buf,
                           BlockCompletionFunc *cb, void *opaque);
+int blk_co_discard(BlockBackend *blk, int64_t sector_num, int nb_sectors);
+int blk_co_flush(BlockBackend *blk);
 int blk_flush(BlockBackend *blk);
 int blk_flush_all(void);
 void blk_drain_all(void);
@@ -120,6 +122,7 @@ int blk_is_read_only(BlockBackend *blk);
 int blk_is_sg(BlockBackend *blk);
 int blk_enable_write_cache(BlockBackend *blk);
 void blk_set_enable_write_cache(BlockBackend *blk, bool wce);
+void blk_invalidate_cache(BlockBackend *blk, Error **errp);
 int blk_is_inserted(BlockBackend *blk);
 void blk_lock_medium(BlockBackend *blk, bool locked);
 void blk_eject(BlockBackend *blk, bool eject_flag);