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block: Assertions for write permissions 

This adds assertions that ensure that the necessary write permissions
have been granted before someone attempts to write to a node.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Acked-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Kevin Wolf 2017-02-09 16:49:53 +01:00
parent 85c97ca7a1
commit afa4b29323
1 changed files with 3 additions and 0 deletions
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3
block/io.c
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@ -945,6 +945,8 @@ static int coroutine_fn bdrv_co_do_copy_on_readv(BdrvChild *child,
size_t skip_bytes;
int ret;
assert(child->perm & (BLK_PERM_WRITE_UNCHANGED | BLK_PERM_WRITE));
/* Cover entire cluster so no additional backing file I/O is required when
* allocating cluster in the image file.
*/
@ -1336,6 +1338,7 @@ static int coroutine_fn bdrv_aligned_pwritev(BdrvChild *child,
assert(!waited || !req->serialising);
assert(req->overlap_offset <= offset);
assert(offset + bytes <= req->overlap_offset + req->overlap_bytes);
assert(child->perm & BLK_PERM_WRITE);
ret = notifier_with_return_list_notify(&bs->before_write_notifiers, req);