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Re: [Qemu-devel] [PATCH v4 03/20] file-posix: Switch to .bdrv_co_block_s

From: Vladimir Sementsov-Ogievskiy
Subject: Re: [Qemu-devel] [PATCH v4 03/20] file-posix: Switch to .bdrv_co_block_status()
Date: Thu, 30 Nov 2017 11:06:17 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.4.0

12.10.2017 21:58, Eric Blake wrote:
We are gradually moving away from sector-based interfaces, towards
byte-based.  Update the file protocol driver accordingly.

In want_zero mode, we continue to report fine-grained hole
information (the caller wants as much mapping detail as possible);
but when not in that mode, the caller prefers larger *pnum and
merely cares about what offsets are allocated at this layer, rather
than where the holes live.  Since holes still read as zeroes at
this layer (rather than deferring to a backing layer), we can take
the shortcut of skipping lseek(), and merely state that all bytes
are allocated.

Signed-off-by: Eric Blake <address@hidden>

Reviewed-by: Vladimir Sementsov-Ogievskiy <address@hidden>

Best regards,

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