From: Eric Blake <eblake@redhat.com>
To: Max Reitz <mreitz@redhat.com>, qemu-block@nongnu.org
Cc: Kevin Wolf <kwolf@redhat.com>, qemu-devel@nongnu.org
Subject: Re: [PATCH 3/4] block: Add blk_make_empty()
Date: Tue, 28 Apr 2020 09:28:43 -0500 [thread overview]
Message-ID: <f9db63b9-f150-44c3-c082-c9fced168471@redhat.com> (raw)
In-Reply-To: <d4cab7f2-2a64-82fb-5eed-1345ebc3367a@redhat.com>
On 4/28/20 8:55 AM, Eric Blake wrote:
>> +++ b/include/sysemu/block-backend.h
>> @@ -266,4 +266,6 @@ int coroutine_fn blk_co_copy_range(BlockBackend
>> *blk_in, int64_t off_in,
>> const BdrvChild *blk_root(BlockBackend *blk);
>> +int blk_make_empty(BlockBackend *blk, Error **errp);
>> +
>
> Again, a flag parameter to allow use of BDRV_REQ_NO_FALLBACK would be nice.
Or maybe not, after reading Kevin's responses. Making an image empty is
not the same as making it read as zero. If we can't come up with a use
for a flag, then deferring the addition of a flag until later is a
perfectly reasonable approach (rather than adding a flag now that will
never get set to anything other than 0). This isn't quite the same as a
public API where we would regret being locked out of a flag down the road.
--
Eric Blake, Principal Software Engineer
Red Hat, Inc. +1-919-301-3226
Virtualization: qemu.org | libvirt.org
next prev parent reply other threads:[~2020-04-28 14:32 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-28 13:26 [PATCH 0/4] block: Do not call BlockDriver.bdrv_make_empty() directly Max Reitz
2020-04-28 13:26 ` [PATCH 1/4] block: Add bdrv_make_empty() Max Reitz
2020-04-28 13:53 ` Eric Blake
2020-04-28 14:01 ` Kevin Wolf
2020-04-28 14:07 ` Eric Blake
2020-04-28 14:16 ` Kevin Wolf
2020-04-28 14:25 ` Eric Blake
2020-04-28 14:21 ` Kevin Wolf
2020-04-29 7:39 ` Max Reitz
2020-04-28 13:26 ` [PATCH 2/4] block: Use bdrv_make_empty() where possible Max Reitz
2020-04-28 13:54 ` Eric Blake
2020-04-28 15:03 ` Kevin Wolf
2020-04-28 13:26 ` [PATCH 3/4] block: Add blk_make_empty() Max Reitz
2020-04-28 13:55 ` Eric Blake
2020-04-28 14:28 ` Eric Blake [this message]
2020-04-28 14:47 ` Kevin Wolf
2020-04-29 7:39 ` Max Reitz
2020-04-28 13:26 ` [PATCH 4/4] block: Use blk_make_empty() after commits Max Reitz
2020-04-28 14:07 ` Eric Blake
2020-04-29 7:58 ` Max Reitz
2020-04-28 15:03 ` Kevin Wolf
2020-04-29 8:01 ` Max Reitz
2020-04-28 13:38 ` [PATCH 0/4] block: Do not call BlockDriver.bdrv_make_empty() directly no-reply
2020-04-28 13:43 ` no-reply
2020-04-28 13:57 ` Eric Blake
2020-04-28 13:48 ` no-reply
2020-04-28 13:49 ` Eric Blake
2020-04-28 14:05 ` Eric Blake
2020-04-28 14:53 ` no-reply
2020-04-28 14:57 ` no-reply
2020-04-28 15:02 ` no-reply
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