qemu-block
[Top][All Lists]
Advanced

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [PATCH 1/3] block: Activate recursively even for already active node


From: Kevin Wolf
Subject: Re: [PATCH 1/3] block: Activate recursively even for already active nodes
Date: Wed, 18 Dec 2019 18:02:24 +0100
User-agent: Mutt/1.12.1 (2019-06-15)

Am 17.12.2019 um 15:59 hat Kevin Wolf geschrieben:
> bdrv_invalidate_cache_all() assumes that all nodes in a given subtree
> are either active or inactive when it starts. Therefore, as soon as it
> arrives at an already active node, it stops.
> 
> However, this assumption is wrong. For example, it's possible to take a
> snapshot of an inactive node, which results in an active overlay over an
> inactive backing file. The active overlay is probably also the root node
> of an inactive BlockBackend (blk->disable_perm == true).
> 
> In this case, bdrv_invalidate_cache_all() does not need to do anything
> to activate the overlay node, but it still needs to recurse into the
> children and the parents to make sure that after returning success,
> really everything is activated.
> 
> Signed-off-by: Kevin Wolf <address@hidden>

Actually:
Cc: address@hidden




reply via email to

[Prev in Thread] Current Thread [Next in Thread]