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Re: [Qemu-devel] [PATCH 16/17] block: add default get_block_status imple
From: |
Paolo Bonzini |
Subject: |
Re: [Qemu-devel] [PATCH 16/17] block: add default get_block_status implementation for protocols |
Date: |
Tue, 16 Jul 2013 09:19:12 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130625 Thunderbird/17.0.7 |
Il 16/07/2013 08:47, Peter Lieven ha scritto:
>>
>> @@ -2977,7 +2977,11 @@ static int64_t coroutine_fn
>> bdrv_co_get_block_status(BlockDriverState *bs,
>> if (!bs->drv->bdrv_co_get_block_status) {
>> *pnum = nb_sectors;
>> - return BDRV_BLOCK_DATA;
>> + ret = BDRV_BLOCK_DATA;
>> + if (bs->drv->protocol_name) {
>> + ret |= BDRV_BLOCK_OFFSET_VALID | (sector_num *
>> BDRV_SECTOR_SIZE);
>> + }
>> + return ret;
>> }
>> ret = bs->drv->bdrv_co_get_block_status(bs, sector_num,
>> nb_sectors, pnum);
> I am curious if this is right. Doesn't this mean we say that at offset
> sector_num * BDRV_SECTOR_SIZE are nb_sectors of linear data? This is
> something we do not know for sure.
Only for protocols. In this case, we do know, or format=raw wouldn't
work. This is not propagated up to the actual BDS for the image, except
for format=raw.
Paolo
- Re: [Qemu-devel] [PATCH 12/17] qemu-img: add a "map" subcommand, (continued)
- [Qemu-devel] [PATCH 11/17] block: return get_block_status data and flags for formats, Paolo Bonzini, 2013/07/03
- [Qemu-devel] [PATCH 14/17] raw-posix: return get_block_status data and flags, Paolo Bonzini, 2013/07/03
- [Qemu-devel] [PATCH 13/17] block: use bdrv_has_zero_init to return BDRV_BLOCK_ZERO, Paolo Bonzini, 2013/07/03
- [Qemu-devel] [PATCH 15/17] raw-posix: detect XFS unwritten extents, Paolo Bonzini, 2013/07/03
- [Qemu-devel] [PATCH 16/17] block: add default get_block_status implementation for protocols, Paolo Bonzini, 2013/07/03
[Qemu-devel] [PATCH 17/17] block: look for zero blocks in bs->file, Paolo Bonzini, 2013/07/03
Re: [Qemu-devel] [PATCH 00/17] Add qemu-img subcommand to dump file metadata, Stefan Hajnoczi, 2013/07/15