block.c (b26ded9a7d9709aacdff36e39630acbb87201057) block.c (5c8cab48087d3544cb788309ac729bca08244020)
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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1209
1210 if (child->bs->inherits_from == parent) {
1211 child->bs->inherits_from = NULL;
1212 }
1213
1214 bdrv_root_unref_child(child);
1215}
1216
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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1209
1210 if (child->bs->inherits_from == parent) {
1211 child->bs->inherits_from = NULL;
1212 }
1213
1214 bdrv_root_unref_child(child);
1215}
1216
1217
1218static void bdrv_parent_cb_change_media(BlockDriverState *bs, bool load)
1219{
1220 BdrvChild *c;
1221 QLIST_FOREACH(c, &bs->parents, next_parent) {
1222 if (c->role->change_media) {
1223 c->role->change_media(c, load);
1224 }
1225 }
1226}
1227
1228static void bdrv_parent_cb_resize(BlockDriverState *bs)
1229{
1230 BdrvChild *c;
1231 QLIST_FOREACH(c, &bs->parents, next_parent) {
1232 if (c->role->resize) {
1233 c->role->resize(c);
1234 }
1235 }
1236}
1237
1217/*
1218 * Sets the backing file link of a BDS. A new reference is created; callers
1219 * which don't need their own reference any more must call bdrv_unref().
1220 */
1221void bdrv_set_backing_hd(BlockDriverState *bs, BlockDriverState *backing_hd)
1222{
1223 if (backing_hd) {
1224 bdrv_ref(backing_hd);

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1668 drv->format_name, entry->key);
1669 }
1670
1671 ret = -EINVAL;
1672 goto close_and_fail;
1673 }
1674
1675 if (!bdrv_key_required(bs)) {
1238/*
1239 * Sets the backing file link of a BDS. A new reference is created; callers
1240 * which don't need their own reference any more must call bdrv_unref().
1241 */
1242void bdrv_set_backing_hd(BlockDriverState *bs, BlockDriverState *backing_hd)
1243{
1244 if (backing_hd) {
1245 bdrv_ref(backing_hd);

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1689 drv->format_name, entry->key);
1690 }
1691
1692 ret = -EINVAL;
1693 goto close_and_fail;
1694 }
1695
1696 if (!bdrv_key_required(bs)) {
1676 if (bs->blk) {
1677 blk_dev_change_media_cb(bs->blk, true);
1678 }
1697 bdrv_parent_cb_change_media(bs, true);
1679 } else if (!runstate_check(RUN_STATE_PRELAUNCH)
1680 && !runstate_check(RUN_STATE_INMIGRATE)
1681 && !runstate_check(RUN_STATE_PAUSED)) { /* HACK */
1682 error_setg(errp,
1683 "Guest must be stopped for opening of encrypted image");
1684 ret = -EBUSY;
1685 goto close_and_fail;
1686 }

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2116
2117 bdrv_drained_begin(bs); /* complete I/O */
2118 bdrv_flush(bs);
2119 bdrv_drain(bs); /* in case flush left pending I/O */
2120
2121 bdrv_release_named_dirty_bitmaps(bs);
2122 assert(QLIST_EMPTY(&bs->dirty_bitmaps));
2123
1698 } else if (!runstate_check(RUN_STATE_PRELAUNCH)
1699 && !runstate_check(RUN_STATE_INMIGRATE)
1700 && !runstate_check(RUN_STATE_PAUSED)) { /* HACK */
1701 error_setg(errp,
1702 "Guest must be stopped for opening of encrypted image");
1703 ret = -EBUSY;
1704 goto close_and_fail;
1705 }

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2135
2136 bdrv_drained_begin(bs); /* complete I/O */
2137 bdrv_flush(bs);
2138 bdrv_drain(bs); /* in case flush left pending I/O */
2139
2140 bdrv_release_named_dirty_bitmaps(bs);
2141 assert(QLIST_EMPTY(&bs->dirty_bitmaps));
2142
2124 if (bs->blk) {
2125 blk_dev_change_media_cb(bs->blk, false);
2126 }
2143 bdrv_parent_cb_change_media(bs, false);
2127
2128 if (bs->drv) {
2129 BdrvChild *child, *next;
2130
2131 bs->drv->bdrv_close(bs);
2132 bs->drv = NULL;
2133
2134 bdrv_set_backing_hd(bs, NULL);

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2569 return -ENOTSUP;
2570 if (bs->read_only)
2571 return -EACCES;
2572
2573 ret = drv->bdrv_truncate(bs, offset);
2574 if (ret == 0) {
2575 ret = refresh_total_sectors(bs, offset >> BDRV_SECTOR_BITS);
2576 bdrv_dirty_bitmap_truncate(bs);
2144
2145 if (bs->drv) {
2146 BdrvChild *child, *next;
2147
2148 bs->drv->bdrv_close(bs);
2149 bs->drv = NULL;
2150
2151 bdrv_set_backing_hd(bs, NULL);

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2586 return -ENOTSUP;
2587 if (bs->read_only)
2588 return -EACCES;
2589
2590 ret = drv->bdrv_truncate(bs, offset);
2591 if (ret == 0) {
2592 ret = refresh_total_sectors(bs, offset >> BDRV_SECTOR_BITS);
2593 bdrv_dirty_bitmap_truncate(bs);
2577 if (bs->blk) {
2578 blk_dev_resize_cb(bs->blk);
2579 }
2594 bdrv_parent_cb_resize(bs);
2580 }
2581 return ret;
2582}
2583
2584/**
2585 * Length of a allocated file in bytes. Sparse files are counted by actual
2586 * allocated space. Return < 0 if error or unknown.
2587 */

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2681 return -EINVAL;
2682 } else if (!bs->drv || !bs->drv->bdrv_set_key) {
2683 return -ENOMEDIUM;
2684 }
2685 ret = bs->drv->bdrv_set_key(bs, key);
2686 if (ret < 0) {
2687 bs->valid_key = 0;
2688 } else if (!bs->valid_key) {
2595 }
2596 return ret;
2597}
2598
2599/**
2600 * Length of a allocated file in bytes. Sparse files are counted by actual
2601 * allocated space. Return < 0 if error or unknown.
2602 */

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2696 return -EINVAL;
2697 } else if (!bs->drv || !bs->drv->bdrv_set_key) {
2698 return -ENOMEDIUM;
2699 }
2700 ret = bs->drv->bdrv_set_key(bs, key);
2701 if (ret < 0) {
2702 bs->valid_key = 0;
2703 } else if (!bs->valid_key) {
2704 /* call the change callback now, we skipped it on open */
2689 bs->valid_key = 1;
2705 bs->valid_key = 1;
2690 if (bs->blk) {
2691 /* call the change callback now, we skipped it on open */
2692 blk_dev_change_media_cb(bs->blk, true);
2693 }
2706 bdrv_parent_cb_change_media(bs, true);
2694 }
2695 return ret;
2696}
2697
2698/*
2699 * Provide an encryption key for @bs.
2700 * If @key is non-null:
2701 * If @bs is not encrypted, fail.

--- 1305 unchanged lines hidden --- 		2707 }
2708 return ret;
2709}
2710
2711/*
2712 * Provide an encryption key for @bs.
2713 * If @key is non-null:
2714 * If @bs is not encrypted, fail.

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