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block/blkio: Set BlockDriver::has_variable_length to false 

Setting it to true can cause the device size to be queried from libblkio
in otherwise fast paths, degrading performance. Set it to false and
require users to refresh the device size explicitly instead.

Fixes: 4c8f4fda05 ("block/blkio: Tolerate device size changes")
Suggested-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Alberto Faria <afaria@redhat.com>
Message-Id: <20221108144433.1334074-1-afaria@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
master
Alberto Faria 2022-11-08 14:44:33 +00:00 committed by Kevin Wolf
parent c785326522
commit e56b0c6631
1 changed files with 0 additions and 1 deletions
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block/blkio.c
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@ -993,7 +993,6 @@ static void blkio_refresh_limits(BlockDriverState *bs, Error **errp)
{ \
.format_name = name, \
.protocol_name = name, \
.has_variable_length = true, \
.instance_size = sizeof(BDRVBlkioState), \
.bdrv_file_open = blkio_file_open, \
.bdrv_close = blkio_close, \