block.c (36fe13317bfc3414745528c6c08cea2904ca49ec) block.c (20018e12cfde4847a0e90f0f9942804c20c14894)
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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654 *writethrough = true;
655 } else {
656 return -1;
657 }
658
659 return 0;
660}
661
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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654 *writethrough = true;
655 } else {
656 return -1;
657 }
658
659 return 0;
660}
661
662static void bdrv_child_cb_drained_begin(BdrvChild *child)
663{
664 BlockDriverState *bs = child->opaque;
665 bdrv_drained_begin(bs);
666}
667
668static void bdrv_child_cb_drained_end(BdrvChild *child)
669{
670 BlockDriverState *bs = child->opaque;
671 bdrv_drained_end(bs);
672}
673
662/*
663 * Returns the options and flags that a temporary snapshot should get, based on
664 * the originally requested flags (the originally requested image will have
665 * flags like a backing file)
666 */
667static void bdrv_temp_snapshot_options(int *child_flags, QDict *child_options,
668 int parent_flags, QDict *parent_options)
669{

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700 flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING | BDRV_O_COPY_ON_READ |
701 BDRV_O_NO_IO);
702
703 *child_flags = flags;
704}
705
706const BdrvChildRole child_file = {
707 .inherit_options = bdrv_inherited_options,
674/*
675 * Returns the options and flags that a temporary snapshot should get, based on
676 * the originally requested flags (the originally requested image will have
677 * flags like a backing file)
678 */
679static void bdrv_temp_snapshot_options(int *child_flags, QDict *child_options,
680 int parent_flags, QDict *parent_options)
681{

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712 flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING | BDRV_O_COPY_ON_READ |
713 BDRV_O_NO_IO);
714
715 *child_flags = flags;
716}
717
718const BdrvChildRole child_file = {
719 .inherit_options = bdrv_inherited_options,
720 .drained_begin = bdrv_child_cb_drained_begin,
721 .drained_end = bdrv_child_cb_drained_end,
708};
709
710/*
711 * Returns the options and flags that bs->file should get if the use of formats
712 * (and not only protocols) is permitted for it, based on the given options and
713 * flags for the parent BDS
714 */
715static void bdrv_inherited_fmt_options(int *child_flags, QDict *child_options,
716 int parent_flags, QDict *parent_options)
717{
718 child_file.inherit_options(child_flags, child_options,
719 parent_flags, parent_options);
720
721 *child_flags &= ~(BDRV_O_PROTOCOL | BDRV_O_NO_IO);
722}
723
724const BdrvChildRole child_format = {
725 .inherit_options = bdrv_inherited_fmt_options,
722};
723
724/*
725 * Returns the options and flags that bs->file should get if the use of formats
726 * (and not only protocols) is permitted for it, based on the given options and
727 * flags for the parent BDS
728 */
729static void bdrv_inherited_fmt_options(int *child_flags, QDict *child_options,
730 int parent_flags, QDict *parent_options)
731{
732 child_file.inherit_options(child_flags, child_options,
733 parent_flags, parent_options);
734
735 *child_flags &= ~(BDRV_O_PROTOCOL | BDRV_O_NO_IO);
736}
737
738const BdrvChildRole child_format = {
739 .inherit_options = bdrv_inherited_fmt_options,
740 .drained_begin = bdrv_child_cb_drained_begin,
741 .drained_end = bdrv_child_cb_drained_end,
726};
727
728/*
729 * Returns the options and flags that bs->backing should get, based on the
730 * given options and flags for the parent BDS
731 */
732static void bdrv_backing_options(int *child_flags, QDict *child_options,
733 int parent_flags, QDict *parent_options)

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745 /* snapshot=on is handled on the top layer */
746 flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_TEMPORARY);
747
748 *child_flags = flags;
749}
750
751static const BdrvChildRole child_backing = {
752 .inherit_options = bdrv_backing_options,
742};
743
744/*
745 * Returns the options and flags that bs->backing should get, based on the
746 * given options and flags for the parent BDS
747 */
748static void bdrv_backing_options(int *child_flags, QDict *child_options,
749 int parent_flags, QDict *parent_options)

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761 /* snapshot=on is handled on the top layer */
762 flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_TEMPORARY);
763
764 *child_flags = flags;
765}
766
767static const BdrvChildRole child_backing = {
768 .inherit_options = bdrv_backing_options,
769 .drained_begin = bdrv_child_cb_drained_begin,
770 .drained_end = bdrv_child_cb_drained_end,
753};
754
755static int bdrv_open_flags(BlockDriverState *bs, int flags)
756{
757 int open_flags = flags;
758
759 /*
760 * Clear flags that are internal to the block layer before opening the

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1190}
1191
1192BdrvChild *bdrv_attach_child(BlockDriverState *parent_bs,
1193 BlockDriverState *child_bs,
1194 const char *child_name,
1195 const BdrvChildRole *child_role)
1196{
1197 BdrvChild *child = bdrv_root_attach_child(child_bs, child_name, child_role,
771};
772
773static int bdrv_open_flags(BlockDriverState *bs, int flags)
774{
775 int open_flags = flags;
776
777 /*
778 * Clear flags that are internal to the block layer before opening the

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1208}
1209
1210BdrvChild *bdrv_attach_child(BlockDriverState *parent_bs,
1211 BlockDriverState *child_bs,
1212 const char *child_name,
1213 const BdrvChildRole *child_role)
1214{
1215 BdrvChild *child = bdrv_root_attach_child(child_bs, child_name, child_role,
1198 NULL);
1216 parent_bs);
1199 QLIST_INSERT_HEAD(&parent_bs->children, child, next);
1200 return child;
1201}
1202
1203static void bdrv_detach_child(BdrvChild *child)
1204{
1205 if (child->next.le_prev) {
1206 QLIST_REMOVE(child, next);

--- 2799 unchanged lines hidden --- 		1217 QLIST_INSERT_HEAD(&parent_bs->children, child, next);
1218 return child;
1219}
1220
1221static void bdrv_detach_child(BdrvChild *child)
1222{
1223 if (child->next.le_prev) {
1224 QLIST_REMOVE(child, next);

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