block.c (3ca1f3225727419ba573673b744edac10904276f) block.c (228ca37e12f97788e05bd0c92f89b3e5e4019607)
1/*
2 * QEMU System Emulator block driver
3 *
4 * Copyright (c) 2003 Fabrice Bellard
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights

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2695 *
2696 * The caller must hold the AioContext lock @child_bs, but not that of @ctx
2697 * (unless @child_bs is already in @ctx).
2698 */
2699BdrvChild *bdrv_root_attach_child(BlockDriverState *child_bs,
2700 const char *child_name,
2701 const BdrvChildClass *child_class,
2702 BdrvChildRole child_role,
1/*
2 * QEMU System Emulator block driver
3 *
4 * Copyright (c) 2003 Fabrice Bellard
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights

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2695 *
2696 * The caller must hold the AioContext lock @child_bs, but not that of @ctx
2697 * (unless @child_bs is already in @ctx).
2698 */
2699BdrvChild *bdrv_root_attach_child(BlockDriverState *child_bs,
2700 const char *child_name,
2701 const BdrvChildClass *child_class,
2702 BdrvChildRole child_role,
2703 AioContext *ctx,
2704 uint64_t perm, uint64_t shared_perm,
2705 void *opaque, Error **errp)
2706{
2707 BdrvChild *child;
2708 Error *local_err = NULL;
2709 int ret;
2703 uint64_t perm, uint64_t shared_perm,
2704 void *opaque, Error **errp)
2705{
2706 BdrvChild *child;
2707 Error *local_err = NULL;
2708 int ret;
2709 AioContext *ctx;
2710
2711 ret = bdrv_check_update_perm(child_bs, NULL, perm, shared_perm, NULL, errp);
2712 if (ret < 0) {
2713 bdrv_abort_perm_update(child_bs);
2714 bdrv_unref(child_bs);
2715 return NULL;
2716 }
2717
2718 child = g_new(BdrvChild, 1);
2719 *child = (BdrvChild) {
2720 .bs = NULL,
2721 .name = g_strdup(child_name),
2722 .klass = child_class,
2723 .role = child_role,
2724 .perm = perm,
2725 .shared_perm = shared_perm,
2726 .opaque = opaque,
2727 };
2728
2710
2711 ret = bdrv_check_update_perm(child_bs, NULL, perm, shared_perm, NULL, errp);
2712 if (ret < 0) {
2713 bdrv_abort_perm_update(child_bs);
2714 bdrv_unref(child_bs);
2715 return NULL;
2716 }
2717
2718 child = g_new(BdrvChild, 1);
2719 *child = (BdrvChild) {
2720 .bs = NULL,
2721 .name = g_strdup(child_name),
2722 .klass = child_class,
2723 .role = child_role,
2724 .perm = perm,
2725 .shared_perm = shared_perm,
2726 .opaque = opaque,
2727 };
2728
2729 ctx = bdrv_child_get_parent_aio_context(child);
2730
2729 /* If the AioContexts don't match, first try to move the subtree of
2730 * child_bs into the AioContext of the new parent. If this doesn't work,
2731 * try moving the parent into the AioContext of child_bs instead. */
2732 if (bdrv_get_aio_context(child_bs) != ctx) {
2733 ret = bdrv_try_set_aio_context(child_bs, ctx, &local_err);
2734 if (ret < 0 && child_class->can_set_aio_ctx) {
2735 GSList *ignore = g_slist_prepend(NULL, child);
2736 ctx = bdrv_get_aio_context(child_bs);

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2781
2782 bdrv_get_cumulative_perm(parent_bs, &perm, &shared_perm);
2783
2784 assert(parent_bs->drv);
2785 bdrv_child_perm(parent_bs, child_bs, NULL, child_role, NULL,
2786 perm, shared_perm, &perm, &shared_perm);
2787
2788 child = bdrv_root_attach_child(child_bs, child_name, child_class,
2731 /* If the AioContexts don't match, first try to move the subtree of
2732 * child_bs into the AioContext of the new parent. If this doesn't work,
2733 * try moving the parent into the AioContext of child_bs instead. */
2734 if (bdrv_get_aio_context(child_bs) != ctx) {
2735 ret = bdrv_try_set_aio_context(child_bs, ctx, &local_err);
2736 if (ret < 0 && child_class->can_set_aio_ctx) {
2737 GSList *ignore = g_slist_prepend(NULL, child);
2738 ctx = bdrv_get_aio_context(child_bs);

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2783
2784 bdrv_get_cumulative_perm(parent_bs, &perm, &shared_perm);
2785
2786 assert(parent_bs->drv);
2787 bdrv_child_perm(parent_bs, child_bs, NULL, child_role, NULL,
2788 perm, shared_perm, &perm, &shared_perm);
2789
2790 child = bdrv_root_attach_child(child_bs, child_name, child_class,
2789 child_role, bdrv_get_aio_context(parent_bs),
2790 perm, shared_perm, parent_bs, errp);
2791 child_role, perm, shared_perm, parent_bs,
2792 errp);
2791 if (child == NULL) {
2792 return NULL;
2793 }
2794
2795 QLIST_INSERT_HEAD(&parent_bs->children, child, next);
2796 return child;
2797}
2798

--- 4512 unchanged lines hidden --- 		2793 if (child == NULL) {
2794 return NULL;
2795 }
2796
2797 QLIST_INSERT_HEAD(&parent_bs->children, child, next);
2798 return child;
2799}
2800

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