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block: Add functions for inheriting a BBRS

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In order to open a BDS which inherits a BB's root state,
blk_get_open_flags_from_root_state() is used to inquire the flags to be
passed to bdrv_open(), and blk_apply_root_state() is used to apply the
remaining state after the BDS has been opened.

Signed-off-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Max Reitz 2015-10-26 21:39:07 +01:00 • committed by Kevin Wolf
parent c69a4dd899
commit 38cb18f5b7
2 changed files with 29 additions and 0 deletions
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2
include/sysemu/block-backend.h
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@ -167,6 +167,8 @@ void blk_io_unplug(BlockBackend *blk);
BlockAcctStats *blk_get_stats(BlockBackend *blk);
BlockBackendRootState *blk_get_root_state(BlockBackend *blk);
void blk_update_root_state(BlockBackend *blk);
void blk_apply_root_state(BlockBackend *blk, BlockDriverState *bs);
int blk_get_open_flags_from_root_state(BlockBackend *blk);
void *blk_aio_get(const AIOCBInfo *aiocb_info, BlockBackend *blk,
BlockCompletionFunc *cb, void *opaque);