From 77485434206bbbfbb7f6a446866f6a327b062d5e Mon Sep 17 00:00:00 2001 From: Max Reitz Date: Mon, 27 Oct 2014 11:12:50 +0100 Subject: block: Add status callback to bdrv_amend_options() Depending on the changed options and the image format, bdrv_amend_options() may take a significant amount of time. In these cases, a way to be informed about the operation's status is desirable. Since the operation is rather complex and may fundamentally change the image, implementing it as AIO or a coroutine does not seem feasible. On the other hand, implementing it as a block job would be significantly more difficult than a simple callback and would not add benefits other than progress report to the amending operation, because it should not actually be run as a block job at all. A callback may not be very pretty, but it's very easy to implement and perfectly fits its purpose here. Signed-off-by: Max Reitz Reviewed-by: Eric Blake Reviewed-by: Benoît Canet Reviewed-by: Kevin Wolf Message-id: 1414404776-4919-2-git-send-email-mreitz@redhat.com Signed-off-by: Stefan Hajnoczi --- include/block/block.h | 8 +++++++- include/block/block_int.h | 3 ++- 2 files changed, 9 insertions(+), 2 deletions(-) (limited to 'include') diff --git a/include/block/block.h b/include/block/block.h index b1f4385f03..5d13282fa9 100644 --- a/include/block/block.h +++ b/include/block/block.h @@ -268,7 +268,13 @@ typedef enum { int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res, BdrvCheckMode fix); -int bdrv_amend_options(BlockDriverState *bs_new, QemuOpts *opts); +/* The units of offset and total_work_size may be chosen arbitrarily by the + * block driver; total_work_size may change during the course of the amendment + * operation */ +typedef void BlockDriverAmendStatusCB(BlockDriverState *bs, int64_t offset, + int64_t total_work_size); +int bdrv_amend_options(BlockDriverState *bs_new, QemuOpts *opts, + BlockDriverAmendStatusCB *status_cb); /* external snapshots */ bool bdrv_recurse_is_first_non_filter(BlockDriverState *bs, diff --git a/include/block/block_int.h b/include/block/block_int.h index a293e92852..a1c17b9578 100644 --- a/include/block/block_int.h +++ b/include/block/block_int.h @@ -232,7 +232,8 @@ struct BlockDriver { int (*bdrv_check)(BlockDriverState* bs, BdrvCheckResult *result, BdrvCheckMode fix); - int (*bdrv_amend_options)(BlockDriverState *bs, QemuOpts *opts); + int (*bdrv_amend_options)(BlockDriverState *bs, QemuOpts *opts, + BlockDriverAmendStatusCB *status_cb); void (*bdrv_debug_event)(BlockDriverState *bs, BlkDebugEvent event); -- cgit v1.2.3-55-g7522