Re: [PATCH v2 02/11] file-posix: Handle zero block status hint better

[Stefan Hajnoczi <stefanha@redhat.com>]

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On Thu, Apr 17, 2025 at 01:39:07PM -0500, Eric Blake wrote:
> Although the previous patch to change 'bool want_zero' into an enum
> made no semantic change, it is now time to differentiate.  When the
> caller specifically wants to know what parts of the file read as zero,
> we need to use lseek and actually reporting holes, rather than
> short-circuiting and advertising full allocation.
> 
> This change will be utilized in later patches to let mirroring
> optimize for the case when the destination already reads as zeroes.
> 
> Signed-off-by: Eric Blake <eblake@redhat.com>
> ---
>  block/file-posix.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>

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