hw: Convert from BlockDriverState to BlockBackend, mostly

Device models should access their block backends only through the
block-backend.h API.  Convert them, and drop direct includes of
inappropriate headers.

Just four uses of BlockDriverState are left:

* The Xen paravirtual block device backend (xen_disk.c) opens images
  itself when set up via xenbus, bypassing blockdev.c.  I figure it
  should go through qmp_blockdev_add() instead.

* Device model "usb-storage" prompts for keys.  No other device model
  does, and this one probably shouldn't do it, either.

* ide_issue_trim_cb() uses bdrv_aio_discard() instead of
  blk_aio_discard() because it fishes its backend out of a BlockAIOCB,
  which has only the BlockDriverState.

* PC87312State has an unused BlockDriverState[] member.

The next two commits take care of the latter two.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

1 files changed, 76 insertions, 0 deletions

diff --git a/include/sysemu/block-backend.h b/include/sysemu/block-backend.h
index b97a794e45..f63817a7cc 100644
--- a/include/sysemu/block-backend.h
+++ b/include/sysemu/block-backend.h
@@ -16,6 +16,15 @@
 #include "qemu/typedefs.h"
 #include "qapi/error.h"
 
+/*
+ * TODO Have to include block/block.h for a bunch of block layer
+ * types.  Unfortunately, this pulls in the whole BlockDriverState
+ * API, which we don't want used by many BlockBackend users.  Some of
+ * the types belong here, and the rest should be split into a common
+ * header and one for the BlockDriverState API.
+ */
+#include "block/block.h"
+
 BlockBackend *blk_new(const char *name, Error **errp);
 BlockBackend *blk_new_with_bs(const char *name, Error **errp);
 void blk_ref(BlockBackend *blk);
@@ -28,4 +37,71 @@ BlockDriverState *blk_bs(BlockBackend *blk);
 
 void blk_hide_on_behalf_of_do_drive_del(BlockBackend *blk);
 
+void blk_iostatus_enable(BlockBackend *blk);
+int blk_attach_dev(BlockBackend *blk, void *dev);
+void blk_attach_dev_nofail(BlockBackend *blk, void *dev);
+void blk_detach_dev(BlockBackend *blk, void *dev);
+void *blk_get_attached_dev(BlockBackend *blk);
+void blk_set_dev_ops(BlockBackend *blk, const BlockDevOps *ops, void *opaque);
+int blk_read(BlockBackend *blk, int64_t sector_num, uint8_t *buf,
+             int nb_sectors);
+int blk_read_unthrottled(BlockBackend *blk, int64_t sector_num, uint8_t *buf,
+                         int nb_sectors);
+int blk_write(BlockBackend *blk, int64_t sector_num, const uint8_t *buf,
+              int nb_sectors);
+BlockAIOCB *blk_aio_write_zeroes(BlockBackend *blk, int64_t sector_num,
+                                 int nb_sectors, BdrvRequestFlags flags,
+                                 BlockCompletionFunc *cb, void *opaque);
+int blk_pread(BlockBackend *blk, int64_t offset, void *buf, int count);
+int blk_pwrite(BlockBackend *blk, int64_t offset, const void *buf, int count);
+int64_t blk_getlength(BlockBackend *blk);
+void blk_get_geometry(BlockBackend *blk, uint64_t *nb_sectors_ptr);
+BlockAIOCB *blk_aio_readv(BlockBackend *blk, int64_t sector_num,
+                          QEMUIOVector *iov, int nb_sectors,
+                          BlockCompletionFunc *cb, void *opaque);
+BlockAIOCB *blk_aio_writev(BlockBackend *blk, int64_t sector_num,
+                           QEMUIOVector *iov, int nb_sectors,
+                           BlockCompletionFunc *cb, void *opaque);
+BlockAIOCB *blk_aio_flush(BlockBackend *blk,
+                          BlockCompletionFunc *cb, void *opaque);
+BlockAIOCB *blk_aio_discard(BlockBackend *blk,
+                            int64_t sector_num, int nb_sectors,
+                            BlockCompletionFunc *cb, void *opaque);
+void blk_aio_cancel(BlockAIOCB *acb);
+void blk_aio_cancel_async(BlockAIOCB *acb);
+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_flush(BlockBackend *blk);
+int blk_flush_all(void);
+void blk_drain_all(void);
+BlockdevOnError blk_get_on_error(BlockBackend *blk, bool is_read);
+BlockErrorAction blk_get_error_action(BlockBackend *blk, bool is_read,
+                                      int error);
+void blk_error_action(BlockBackend *blk, BlockErrorAction action,
+                      bool is_read, int error);
+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);
+int blk_is_inserted(BlockBackend *blk);
+void blk_lock_medium(BlockBackend *blk, bool locked);
+void blk_eject(BlockBackend *blk, bool eject_flag);
+int blk_get_flags(BlockBackend *blk);
+void blk_set_guest_block_size(BlockBackend *blk, int align);
+void *blk_blockalign(BlockBackend *blk, size_t size);
+bool blk_op_is_blocked(BlockBackend *blk, BlockOpType op, Error **errp);
+void blk_op_unblock(BlockBackend *blk, BlockOpType op, Error *reason);
+void blk_op_block_all(BlockBackend *blk, Error *reason);
+void blk_op_unblock_all(BlockBackend *blk, Error *reason);
+AioContext *blk_get_aio_context(BlockBackend *blk);
+void blk_set_aio_context(BlockBackend *blk, AioContext *new_context);
+void blk_io_plug(BlockBackend *blk);
+void blk_io_unplug(BlockBackend *blk);
+BlockAcctStats *blk_get_stats(BlockBackend *blk);
+
+void *blk_aio_get(const AIOCBInfo *aiocb_info, BlockBackend *blk,
+                  BlockCompletionFunc *cb, void *opaque);
+
 #endif