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block: Add functions for inheriting a BBRS 

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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27
block/block-backend.c
View File

@ -1239,6 +1239,33 @@ void blk_update_root_state(BlockBackend *blk)
}
}
/*
* Applies the information in the root state to the given BlockDriverState. This
* does not include the flags which have to be specified for bdrv_open(), use
* blk_get_open_flags_from_root_state() to inquire them.
*/
void blk_apply_root_state(BlockBackend *blk, BlockDriverState *bs)
{
bs->detect_zeroes = blk->root_state.detect_zeroes;
if (blk->root_state.throttle_group) {
bdrv_io_limits_enable(bs, blk->root_state.throttle_group);
}
}
/*
* Returns the flags to be used for bdrv_open() of a BlockDriverState which is
* supposed to inherit the root state.
*/
int blk_get_open_flags_from_root_state(BlockBackend *blk)
{
int bs_flags;
bs_flags = blk->root_state.read_only ? 0 : BDRV_O_RDWR;
bs_flags |= blk->root_state.open_flags & ~BDRV_O_RDWR;
return bs_flags;
}
BlockBackendRootState *blk_get_root_state(BlockBackend *blk)
{
return &blk->root_state;

2
include/sysemu/block-backend.h
View File

@ -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);