Commit 3d2acaa3 authored by Peter Lieven's avatar Peter Lieven Committed by Paolo Bonzini
Browse files

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: default avatarPeter Lieven <pl@kamp.de>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 5917af81

block/iscsi.c

+1 −1
Original line number Diff line number Diff line
@@ -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;