On 08/03/2012 01:49 AM, Luiz Capitulino wrote:
> On Tue, 31 Jul 2012 03:04:22 +0530
> Supriya Kannery<supri...@linux.vnet.ibm.com> wrote:
>
>> +
>> +void bdrv_reopen_commit(BlockDriverState *bs, BDRVReopenState *rs)
>> +{
>> + BlockDriver *drv = bs->drv;
>> +
>> + drv->bdrv_reopen_commit(bs, rs);
>> +}
>> +
>> +void bdrv_reopen_abort(BlockDriverState *bs, BDRVReopenState *rs)
>> +{
>> + BlockDriver *drv = bs->drv;
>> +
>> + drv->bdrv_reopen_abort(bs, rs);
>> +}
>> +
>> +void bdrv_reopen(BlockDriverState *bs, int bdrv_flags, Error **errp)
>> +{
>> + BlockDriver *drv = bs->drv;
>> + int ret = 0;
>> + BDRVReopenState *reopen_state = NULL;
>> +
>> + /* Quiesce IO for the given block device */
>> + bdrv_drain_all();
>> + ret = bdrv_flush(bs);
>> + if (ret != 0) {
>> + error_set(errp, QERR_IO_ERROR);
>> + return;
>> + }
>> +
>> + /* Use driver specific reopen() if available */
>> + if (drv->bdrv_reopen_prepare) {
>> + ret = bdrv_reopen_prepare(bs,&reopen_state, bdrv_flags);
>> + if (ret< 0) {
>> + bdrv_reopen_abort(bs, reopen_state);
>
> Why do you have to call bdrv_reopen_abort()? I'd expect bdrv_reopen_prepare()
> (to be able) to undo anything it has done.
>
Having separate abort function avoids cluttering of reopen-
prepare(). We wanted to logically separate out preparation, commit and
abort. Same format is followed in implementations at block driver level
as well.
-thanks, Supriya
