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Re: [PATCH v4 09/16] block/io: use int64_t bytes in driver wrappers
From: |
Eric Blake |
Subject: |
Re: [PATCH v4 09/16] block/io: use int64_t bytes in driver wrappers |
Date: |
Fri, 22 Jan 2021 10:02:53 -0600 |
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Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.6.0 |
On 12/11/20 12:39 PM, Vladimir Sementsov-Ogievskiy wrote:
> We are generally moving to int64_t for both offset and bytes parameters
> on all io paths.
>
> Main motivation is realization of 64-bit write_zeroes operation for
> fast zeroing large disk chunks, up to the whole disk.
>
> We chose signed type, to be consistent with off_t (which is signed) and
> with possibility for signed return type (where negative value means
> error).
>
> So, convert driver wrappers parameters which are already 64bit to
> signed type.
>
> Requests in block/io.c must never exceed BDRV_MAX_LENGTH (which is less
> than INT64_MAX), which makes the conversion to signed 64bit type safe.
>
> Add corresponding assertions.
>
> Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
> ---
> block/io.c | 12 ++++++++----
> 1 file changed, 8 insertions(+), 4 deletions(-)
>
Reviewed-by: Eric Blake <eblake@redhat.com>
--
Eric Blake, Principal Software Engineer
Red Hat, Inc. +1-919-301-3226
Virtualization: qemu.org | libvirt.org
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