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Revert "block/io: Comment out permission assertions"

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This reverts commit e3e0003a8f.

This commit was necessary for the 2.9 release because we were unable to
fix the underlying issue(s) in time. However, we will be for 2.10.

Signed-off-by: Max Reitz <mreitz@redhat.com>
Acked-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Max Reitz 2017-04-11 17:52:26 +02:00 committed by Kevin Wolf
parent 0d5e0bb2f7
commit 362b3786eb
2 changed files with 3 additions and 15 deletions
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6
block.c
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@ -3313,11 +3313,7 @@ int bdrv_truncate(BdrvChild *child, int64_t offset)
BlockDriver *drv = bs->drv;
int ret;
/* FIXME: Some format block drivers use this function instead of implicitly
* growing their file by writing beyond its end.
* See bdrv_aligned_pwritev() for an explanation why we currently
* cannot assert this permission in that case. */
// assert(child->perm & BLK_PERM_RESIZE);
assert(child->perm & BLK_PERM_RESIZE);
if (!drv)
return -ENOMEDIUM;

12
block/io.c
View File

@ -1362,16 +1362,8 @@ 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);
/* FIXME: Block migration uses the BlockBackend of the guest device at a
* point when it has not yet taken write permissions. This will be
* fixed by a future patch, but for now we have to bypass this
* assertion for block migration to work. */
// assert(child->perm & BLK_PERM_WRITE);
/* FIXME: Because of the above, we also cannot guarantee that all format
* BDS take the BLK_PERM_RESIZE permission on their file BDS, since
* they are not obligated to do so if they do not have any parent
* that has taken the permission to write to them. */
// assert(end_sector <= bs->total_sectors || child->perm & BLK_PERM_RESIZE);
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);