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block: use the new _change_ API instead of _can_set_ and _set_ 

Replace all direct usage of ->can_set_aio_ctx and ->set_aio_ctx,
and call bdrv_child_try_change_aio_context() in
bdrv_try_set_aio_context(), the main function called through
the whole block layer.

From this point onwards, ->can_set_aio_ctx and ->set_aio_ctx
won't be used anymore.

Signed-off-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Message-Id: <20221025084952.2139888-8-eesposit@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Emanuele Giuseppe Esposito 2022-10-25 04:49:49 -04:00 committed by Kevin Wolf
parent 3394939621
commit f8be48adf0
2 changed files with 31 additions and 21 deletions
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44
block.c
View File

@ -2924,17 +2924,21 @@ static void bdrv_attach_child_common_abort(void *opaque)
}
if (bdrv_child_get_parent_aio_context(s->child) != s->old_parent_ctx) {
GSList *ignore;
Transaction *tran;
GHashTable *visited;
bool ret;
/* No need to ignore `child`, because it has been detached already */
ignore = NULL;
s->child->klass->can_set_aio_ctx(s->child, s->old_parent_ctx, &ignore,
&error_abort);
g_slist_free(ignore);
tran = tran_new();
ignore = NULL;
s->child->klass->set_aio_ctx(s->child, s->old_parent_ctx, &ignore);
g_slist_free(ignore);
/* No need to visit `child`, because it has been detached already */
visited = g_hash_table_new(NULL, NULL);
ret = s->child->klass->change_aio_ctx(s->child, s->old_parent_ctx,
visited, tran, &error_abort);
g_hash_table_destroy(visited);
/* transaction is supposed to always succeed */
assert(ret == true);
tran_commit(tran);
}
bdrv_unref(bs);
@ -2989,18 +2993,20 @@ static BdrvChild *bdrv_attach_child_common(BlockDriverState *child_bs,
Error *local_err = NULL;
int ret = bdrv_try_set_aio_context(child_bs, parent_ctx, &local_err);
if (ret < 0 && child_class->can_set_aio_ctx) {
GSList *ignore = g_slist_prepend(NULL, new_child);
if (child_class->can_set_aio_ctx(new_child, child_ctx, &ignore,
NULL))
{
if (ret < 0 && child_class->change_aio_ctx) {
Transaction *tran = tran_new();
GHashTable *visited = g_hash_table_new(NULL, NULL);
bool ret_child;
g_hash_table_add(visited, new_child);
ret_child = child_class->change_aio_ctx(new_child, child_ctx,
visited, tran, NULL);
if (ret_child == true) {
error_free(local_err);
ret = 0;
g_slist_free(ignore);
ignore = g_slist_prepend(NULL, new_child);
child_class->set_aio_ctx(new_child, child_ctx, &ignore);
}
g_slist_free(ignore);
tran_finalize(tran, ret_child == true ? 0 : -1);
g_hash_table_destroy(visited);
}
if (ret < 0) {
@ -7601,7 +7607,7 @@ int bdrv_try_set_aio_context(BlockDriverState *bs, AioContext *ctx,
Error **errp)
{
GLOBAL_STATE_CODE();
return bdrv_child_try_set_aio_context(bs, ctx, NULL, errp);
return bdrv_child_try_change_aio_context(bs, ctx, NULL, errp);
}
void bdrv_add_aio_context_notifier(BlockDriverState *bs,

8
block/block-backend.c
View File

@ -2153,8 +2153,12 @@ static int blk_do_set_aio_context(BlockBackend *blk, AioContext *new_context,
bdrv_ref(bs);
if (update_root_node) {
ret = bdrv_child_try_set_aio_context(bs, new_context, blk->root,
errp);
/*
* update_root_node MUST be false for blk_root_set_aio_ctx_commit(),
* as we are already in the commit function of a transaction.
*/
ret = bdrv_child_try_change_aio_context(bs, new_context, blk->root,
errp);
if (ret < 0) {
bdrv_unref(bs);
return ret;