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parallels: naive implementation of parallels_co_pwrite_zeroes

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The zero flag is missed in the Parallels format specification. We can
resort to discard if we have no backing file.

Signed-off-by: Denis V. Lunev <den@openvz.org>
Reviewed-by: Alexander Ivanov <alexander.ivanov@virtuozzo.com>
This commit is contained in:
Denis V. Lunev 2023-09-18 20:00:59 +02:00
parent 4248e34be9
commit a98b260a52
1 changed files with 14 additions and 0 deletions
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14
block/parallels.c
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@ -582,6 +582,19 @@ done:
return ret;
}
static int coroutine_fn GRAPH_RDLOCK
parallels_co_pwrite_zeroes(BlockDriverState *bs, int64_t offset, int64_t bytes,
BdrvRequestFlags flags)
{
/*
* The zero flag is missed in the Parallels format specification. We can
* resort to discard if we have no backing file (this condition is checked
* inside parallels_co_pdiscard().
*/
return parallels_co_pdiscard(bs, offset, bytes);
}
static void parallels_check_unclean(BlockDriverState *bs,
BdrvCheckResult *res,
BdrvCheckMode fix)
@ -1463,6 +1476,7 @@ static BlockDriver bdrv_parallels = {
.bdrv_co_create_opts = parallels_co_create_opts,
.bdrv_co_check = parallels_co_check,
.bdrv_co_pdiscard = parallels_co_pdiscard,
.bdrv_co_pwrite_zeroes = parallels_co_pwrite_zeroes,
};
static void bdrv_parallels_init(void)