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block/dirty-bitmap: add readonly field to BdrvDirtyBitmap

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It will be needed in following commits for persistent bitmaps.
If bitmap is loaded from read-only storage (and we can't mark it
"in use" in this storage) corresponding BdrvDirtyBitmap should be
read-only.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-id: 20170628120530.31251-11-vsementsov@virtuozzo.com
Signed-off-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Vladimir Sementsov-Ogievskiy 2017-06-28 15:05:10 +03:00 • committed by Max Reitz
parent 8bfc932e1e
commit d6883bc968
4 changed files with 54 additions and 0 deletions
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6
blockdev.c
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@ -2033,6 +2033,9 @@ static void block_dirty_bitmap_clear_prepare(BlkActionState *common,
} else if (!bdrv_dirty_bitmap_enabled(state->bitmap)) {
error_setg(errp, "Cannot clear a disabled bitmap");
return;
} else if (bdrv_dirty_bitmap_readonly(state->bitmap)) {
error_setg(errp, "Cannot clear a readonly bitmap");
return;
}
bdrv_clear_dirty_bitmap(state->bitmap, &state->backup);
@ -2779,6 +2782,9 @@ void qmp_block_dirty_bitmap_clear(const char *node, const char *name,
"Bitmap '%s' is currently disabled and cannot be cleared",
name);
return;
} else if (bdrv_dirty_bitmap_readonly(bitmap)) {
error_setg(errp, "Bitmap '%s' is readonly and cannot be cleared", name);
return;
}
bdrv_clear_dirty_bitmap(bitmap, NULL);