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Re: [Qemu-devel] [PATCH v2 12/17] block: Convert bdrv_write() to BdrvChi
From: |
Kevin Wolf |
Subject: |
Re: [Qemu-devel] [PATCH v2 12/17] block: Convert bdrv_write() to BdrvChild |
Date: |
Wed, 29 Jun 2016 17:33:58 +0200 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
Am 29.06.2016 um 17:22 hat Max Reitz geschrieben:
> On 29.06.2016 14:11, Kevin Wolf wrote:
> > Signed-off-by: Kevin Wolf <address@hidden>
> > Acked-by: Stefan Hajnoczi <address@hidden>
> > ---
> >
> > This patch contains non-trivial fixes, so I think it's worth sending out a
> > v2
> > for it even though I already applied the series. I added a coroutine entry
> > wrapper qcow(2)_write that can be used from .bdrv_write_compressed. These
> > wrappers will soon disappear again when .bdrv_write_compressed is changed
> > into
> > .bdrv_co_pwritev_compressed (Pavel Butsykin's backup compression series).
> >
> > block/io.c | 5 +++--
> > block/qcow.c | 45 ++++++++++++++++++++++++++++++++++++++++++++-
> > block/qcow2-cluster.c | 2 +-
> > block/qcow2-refcount.c | 2 +-
> > block/qcow2.c | 47 ++++++++++++++++++++++++++++++++++++++++++++++-
> > block/vdi.c | 4 ++--
> > block/vvfat.c | 5 ++---
> > include/block/block.h | 2 +-
> > 8 files changed, 100 insertions(+), 12 deletions(-)
>
> Reviewed-by: Max Reitz <address@hidden>
>
> [...]
>
> > diff --git a/block/qcow2.c b/block/qcow2.c
> > index 0178931..cd9c27b 100644
> > --- a/block/qcow2.c
> > +++ b/block/qcow2.c
> > @@ -2533,6 +2533,51 @@ static int qcow2_truncate(BlockDriverState *bs,
> > int64_t offset)
> > return 0;
> > }
> >
> > +typedef struct Qcow2WriteCo {
> > + BlockDriverState *bs;
> > + int64_t sector_num;
> > + const uint8_t *buf;
> > + int nb_sectors;
> > + int ret;
> > +} Qcow2WriteCo;
> > +
> > +static void qcow2_write_co_entry(void *opaque)
> > +{
> > + Qcow2WriteCo *co = opaque;
> > + QEMUIOVector qiov;
> > + uint64_t offset = co->sector_num * BDRV_SECTOR_SIZE;
> > + uint64_t bytes = co->nb_sectors * BDRV_SECTOR_SIZE;
>
> It doesn't make much sense to make this a uint64_t, and I'm afraid
> Coverity will complain about it... It's not wrong, though, but an int
> would have been more "honest".
Hm, just copied from vmdk... Anyway, you right that we don't really need
uint64_t here because of BDRV_REQUEST_MAX_SECTORS, but BDRV_SECTOR_SIZE
is unsigned long long, so at least this is a proper 64 bit calculation
and Coverity should stay silent.
Kevin
pgpHINQnXOe5S.pgp
Description: PGP signature
- [Qemu-devel] [PATCH 05/17] block: Convert bdrv_co_writev() to BdrvChild, (continued)
[Qemu-devel] [PATCH 06/17] block: Convert bdrv_aio_readv() to BdrvChild, Kevin Wolf, 2016/06/21
[Qemu-devel] [PATCH 10/17] block: Use BlockBackend for I/O in bdrv_commit(), Kevin Wolf, 2016/06/21
[Qemu-devel] [PATCH 09/17] block: Move bdrv_commit() to block/commit.c, Kevin Wolf, 2016/06/21
[Qemu-devel] [PATCH 11/17] block: Convert bdrv_read() to BdrvChild, Kevin Wolf, 2016/06/21
[Qemu-devel] [PATCH 16/17] block: Convert bdrv_prwv_co() to BdrvChild, Kevin Wolf, 2016/06/21