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Re: [Qemu-devel] [PATCH 2/3] block: set bs->read_only before .bdrv_open(
From: |
Stefan Hajnoczi |
Subject: |
Re: [Qemu-devel] [PATCH 2/3] block: set bs->read_only before .bdrv_open() |
Date: |
Thu, 27 Oct 2011 11:41:04 +0100 |
On Thu, Oct 27, 2011 at 11:18 AM, Kevin Wolf <address@hidden> wrote:
> Am 27.10.2011 11:54, schrieb Stefan Hajnoczi:
>> Several block drivers set bs->read_only in .bdrv_open() but
>> block.c:bdrv_open_common() clobbers its value. Additionally, QED uses
>> bdrv_is_read_only() in .bdrv_open() to decide whether to perform
>> consistency checks.
>>
>> The correct ordering is to initialize bs->read_only from the open flags
>> before calling .bdrv_open(). This way block drivers can override it if
>> necessary and can use bdrv_is_read_only() in .bdrv_open().
>>
>> Signed-off-by: Stefan Hajnoczi <address@hidden>
>> ---
>> block.c | 4 ++--
>> 1 files changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/block.c b/block.c
>> index 70aab63..3207e99 100644
>> --- a/block.c
>> +++ b/block.c
>> @@ -500,6 +500,8 @@ static int bdrv_open_common(BlockDriverState *bs, const
>> char *filename,
>> open_flags |= BDRV_O_RDWR;
>> }
>> + bs->keep_read_only = bs->read_only = !(open_flags & BDRV_O_RDWR);
>> +
>> /* Open the image, either directly or using a protocol */
>> if (drv->bdrv_file_open) {
>> ret = drv->bdrv_file_open(bs, filename, open_flags);
>> @@ -514,8 +516,6 @@ static int bdrv_open_common(BlockDriverState *bs, const
>> char *filename,
>> goto free_and_fail;
>> }
>>
>> - bs->keep_read_only = bs->read_only = !(open_flags & BDRV_O_RDWR);
>> -
>
> The assignment was already at the new place before 4dca4b6. Not sure if
> there was any real reason for moving it, though.
Naphtali: any ideas why your commit needed to move bs->read_only assignment?
Stefan