From 6bd01f14dbef06dc22c0400f12dfbef06ab6b766 Mon Sep 17 00:00:00 2001 From: Eric Blake Date: Fri, 15 Jul 2016 12:32:04 -0600 Subject: [PATCH] iscsi: Rely on block layer to break up large requests Now that the block layer honors max_request, we don't need to bother with an EINVAL on overlarge requests, but can instead assert that requests are well-behaved. Signed-off-by: Eric Blake Reviewed-by: Fam Zheng Reviewed-by: Stefan Hajnoczi Acked-by: Paolo Bonzini Message-id: 1468607524-19021-7-git-send-email-eblake@redhat.com Signed-off-by: Stefan Hajnoczi --- block/iscsi.c | 14 ++++---------- 1 file changed, 4 insertions(+), 10 deletions(-) diff --git a/block/iscsi.c b/block/iscsi.c index 129c3afa68..5602abdc6a 100644 --- a/block/iscsi.c +++ b/block/iscsi.c @@ -586,11 +586,8 @@ iscsi_co_writev_flags(BlockDriverState *bs, int64_t sector_num, int nb_sectors, return -EINVAL; } - if (bs->bl.max_transfer && - nb_sectors << BDRV_SECTOR_BITS > bs->bl.max_transfer) { - error_report("iSCSI Error: Write of %d sectors exceeds max_xfer_len " - "of %" PRIu32 " bytes", nb_sectors, bs->bl.max_transfer); - return -EINVAL; + if (bs->bl.max_transfer) { + assert(nb_sectors << BDRV_SECTOR_BITS <= bs->bl.max_transfer); } lba = sector_qemu2lun(sector_num, iscsilun); @@ -754,11 +751,8 @@ static int coroutine_fn iscsi_co_readv(BlockDriverState *bs, return -EINVAL; } - if (bs->bl.max_transfer && - nb_sectors << BDRV_SECTOR_BITS > bs->bl.max_transfer) { - error_report("iSCSI Error: Read of %d sectors exceeds max_xfer_len " - "of %" PRIu32 " bytes", nb_sectors, bs->bl.max_transfer); - return -EINVAL; + if (bs->bl.max_transfer) { + assert(nb_sectors << BDRV_SECTOR_BITS <= bs->bl.max_transfer); } /* if cache.direct is off and we have a valid entry in our allocation map -- 2.11.0