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block: Assertions for resize permission

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This adds an assertion that ensures that the necessary resize permission
has been granted before bdrv_truncate() is called.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Acked-by: Fam Zheng <famz@redhat.com>
This commit is contained in:
Kevin Wolf 2017-02-17 14:52:00 +01:00
parent afa4b29323
commit c8f6d58edb
2 changed files with 4 additions and 0 deletions
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3
block.c
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@ -3122,6 +3122,9 @@ int bdrv_truncate(BdrvChild *child, int64_t offset)
BlockDriverState *bs = child->bs;
BlockDriver *drv = bs->drv;
int ret;
assert(child->perm & BLK_PERM_RESIZE);
if (!drv)
return -ENOMEDIUM;
if (!drv->bdrv_truncate)

1
block/io.c
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@ -1339,6 +1339,7 @@ static int coroutine_fn bdrv_aligned_pwritev(BdrvChild *child,
assert(req->overlap_offset <= offset);
assert(offset + bytes <= req->overlap_offset + req->overlap_bytes);
assert(child->perm & BLK_PERM_WRITE);
assert(end_sector <= bs->total_sectors || child->perm & BLK_PERM_RESIZE);
ret = notifier_with_return_list_notify(&bs->before_write_notifiers, req);