motorhead/qemu
1
0
Fork 0
mirror of https://github.com/Motorhead1991/qemu.git synced 2025-08-05 16:53:55 -06:00
Code Issues Projects Releases Packages Wiki Activity Actions

block: Add blk_remove_all_bs()

Browse source 
When bdrv_close_all() is called, instead of force-closing all root
BlockDriverStates, it is better to just drop the reference from all
BlockBackends and let them be closed automatically. This prevents BDS
from getting closed that are still referenced by other BDS, which may
result in loss of cached data.

This patch adds a function for doing that, but does not yet incorporate
it in bdrv_close_all().

Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Max Reitz 2016-01-29 16:36:13 +01:00
parent 9c4218e957
commit d8da3cef3b
2 changed files with 16 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

15
block/block-backend.c
View file

@ -223,6 +223,21 @@ void blk_unref(BlockBackend *blk)
}
}
void blk_remove_all_bs(void)
{
BlockBackend *blk;
QTAILQ_FOREACH(blk, &blk_backends, link) {
AioContext *ctx = blk_get_aio_context(blk);
aio_context_acquire(ctx);
if (blk->bs) {
blk_remove_bs(blk);
}
aio_context_release(ctx);
}
}
/*
* Return the BlockBackend after @blk.
* If @blk is null, return the first one.