From 1c89e1fa2fb1414f4485a01924032ad9cdb9073d Mon Sep 17 00:00:00 2001 From: Kevin Wolf Date: Tue, 20 Sep 2016 13:38:40 +0200 Subject: [PATCH] block: Add blk_by_dev() This finds a BlockBackend given the device model that is attached to it. Signed-off-by: Kevin Wolf Reviewed-by: Eric Blake --- block/block-backend.c | 19 +++++++++++++++++++ include/sysemu/block-backend.h | 1 + 2 files changed, 20 insertions(+) diff --git a/block/block-backend.c b/block/block-backend.c index d1349d9..0bd19ab 100644 --- a/block/block-backend.c +++ b/block/block-backend.c @@ -560,6 +560,25 @@ void *blk_get_attached_dev(BlockBackend *blk) } /* + * Return the BlockBackend which has the device model @dev attached if it + * exists, else null. + * + * @dev must not be null. + */ +BlockBackend *blk_by_dev(void *dev) +{ + BlockBackend *blk = NULL; + + assert(dev != NULL); + while ((blk = blk_all_next(blk)) != NULL) { + if (blk->dev == dev) { + return blk; + } + } + return NULL; +} + +/* * Set @blk's device model callbacks to @ops. * @opaque is the opaque argument to pass to the callbacks. * This is for use by device models. diff --git a/include/sysemu/block-backend.h b/include/sysemu/block-backend.h index 4808a96..410eb68 100644 --- a/include/sysemu/block-backend.h +++ b/include/sysemu/block-backend.h @@ -111,6 +111,7 @@ 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); +BlockBackend *blk_by_dev(void *dev); void blk_set_dev_ops(BlockBackend *blk, const BlockDevOps *ops, void *opaque); int blk_pread_unthrottled(BlockBackend *blk, int64_t offset, uint8_t *buf, int count); -- 2.7.4