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block: Make BlockBackend own its BlockDriverState

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On BlockBackend destruction, unref its BlockDriverState.  Replaces the
callers' unrefs.

This turns the pointer from BlockBackend to BlockDriverState into a
strong reference, managed with bdrv_ref() / bdrv_unref().  The
back-pointer remains weak.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-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:
Markus Armbruster 2014-10-07 13:59:08 +02:00 • committed by Kevin Wolf
parent 8fb3c76c94
commit 9ba10c95a4
6 changed files with 7 additions and 53 deletions
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5
qemu-io.c
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@ -38,7 +38,6 @@ static ReadLineState *readline_state;
static int close_f(BlockDriverState *bs, int argc, char **argv)
{
bdrv_unref(bs);
blk_unref(qemuio_blk);
qemuio_bs = NULL;
qemuio_blk = NULL;
@ -74,7 +73,6 @@ static int openfile(char *name, int flags, int growable, QDict *opts)
name ? " device " : "", name ?: "",
error_get_pretty(local_err));
error_free(local_err);
bdrv_unref(qemuio_bs);
blk_unref(qemuio_blk);
qemuio_bs = NULL;
qemuio_blk = NULL;
@ -488,9 +486,6 @@ int main(int argc, char **argv)
*/
bdrv_drain_all();
if (qemuio_bs) {
bdrv_unref(qemuio_bs);
}
blk_unref(qemuio_blk);
g_free(readline_state);
return 0;