From 3d2acaa308bfab65329ef983654b302899bfb2b0 Mon Sep 17 00:00:00 2001 From: Peter Lieven Date: Mon, 28 Apr 2014 17:18:32 +0200 Subject: block/iscsi: allow cluster_size of 4K and greater depending on the target the opt_unmap_gran might be as low as 4K. As we know use this also as a knob to activate the allocationmap feature lower the barrier. The limit 4K (and not 512) is choosen to avoid a potentially too big allocationmap. Signed-off-by: Peter Lieven Signed-off-by: Paolo Bonzini --- block/iscsi.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'block') diff --git a/block/iscsi.c b/block/iscsi.c index e8d26bb78..84bedfa8f 100644 --- a/block/iscsi.c +++ b/block/iscsi.c @@ -1386,7 +1386,7 @@ static int iscsi_open(BlockDriverState *bs, QDict *options, int flags, /* Guess the internal cluster (page) size of the iscsi target by the means * of opt_unmap_gran. Transfer the unmap granularity only if it has a * reasonable size */ - if (iscsilun->bl.opt_unmap_gran * iscsilun->block_size >= 64 * 1024 && + if (iscsilun->bl.opt_unmap_gran * iscsilun->block_size >= 4 * 1024 && iscsilun->bl.opt_unmap_gran * iscsilun->block_size <= 16 * 1024 * 1024) { iscsilun->cluster_sectors = (iscsilun->bl.opt_unmap_gran * iscsilun->block_size) >> BDRV_SECTOR_BITS; -- cgit v1.2.3