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Re: [Qemu-devel] [PATCH v3 15/19] block: use bdrv_has_zero_init to retur
From: |
Kevin Wolf |
Subject: |
Re: [Qemu-devel] [PATCH v3 15/19] block: use bdrv_has_zero_init to return BDRV_BLOCK_ZERO |
Date: |
Wed, 31 Jul 2013 11:16:09 +0200 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
Am 25.07.2013 um 16:23 hat Paolo Bonzini geschrieben:
> Alternatively, this could use a "discard zeroes data" flag returned
> by bdrv_get_info.
>
> Reviewed-by: Eric Blake <address@hidden>
> Signed-off-by: Paolo Bonzini <address@hidden>
> ---
> block.c | 8 +++++++-
> 1 file changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/block.c b/block.c
> index 7cfbf71..fc1da56 100644
> --- a/block.c
> +++ b/block.c
> @@ -2991,6 +2991,7 @@ static int64_t coroutine_fn
> bdrv_co_get_block_status(BlockDriverState *bs,
> int nb_sectors, int
> *pnum)
> {
> int64_t n;
> + int64_t ret;
>
> if (sector_num >= bs->total_sectors) {
> *pnum = 0;
> @@ -3007,7 +3008,12 @@ static int64_t coroutine_fn
> bdrv_co_get_block_status(BlockDriverState *bs,
> return BDRV_BLOCK_DATA;
> }
>
> - return bs->drv->bdrv_co_get_block_status(bs, sector_num, nb_sectors,
> pnum);
> + ret = bs->drv->bdrv_co_get_block_status(bs, sector_num, nb_sectors,
> pnum);
I think here you should check for ret < 0 before modifying bits.
> + if (!(ret & BDRV_BLOCK_DATA) && bdrv_has_zero_init(bs)) {
> + ret |= BDRV_BLOCK_ZERO;
> + }
> +
> + return ret;
> }
Kevin
- [Qemu-devel] [PATCH v3 13/19] qemu-img: add a "map" subcommand, (continued)
[Qemu-devel] [PATCH v3 14/19] docs, qapi: document qemu-img map, Paolo Bonzini, 2013/07/25
[Qemu-devel] [PATCH v3 15/19] block: use bdrv_has_zero_init to return BDRV_BLOCK_ZERO, Paolo Bonzini, 2013/07/25
- Re: [Qemu-devel] [PATCH v3 15/19] block: use bdrv_has_zero_init to return BDRV_BLOCK_ZERO,
Kevin Wolf <=
[Qemu-devel] [PATCH v3 16/19] raw-posix: return get_block_status data and flags, Paolo Bonzini, 2013/07/25
[Qemu-devel] [PATCH v3 17/19] raw-posix: detect XFS unwritten extents, Paolo Bonzini, 2013/07/25
[Qemu-devel] [PATCH v3 18/19] block: add default get_block_status implementation for protocols, Paolo Bonzini, 2013/07/25
[Qemu-devel] [PATCH v3 19/19] block: look for zero blocks in bs->file, Paolo Bonzini, 2013/07/25