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[Qemu-devel] [PATCH] block/iscsi: allow cluster_size of 4K and greater
From: |
Peter Lieven |
Subject: |
[Qemu-devel] [PATCH] block/iscsi: allow cluster_size of 4K and greater |
Date: |
Mon, 28 Apr 2014 17:18:32 +0200 |
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 <address@hidden>
---
block/iscsi.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/block/iscsi.c b/block/iscsi.c
index eca8a22..944f2ce 100644
--- a/block/iscsi.c
+++ b/block/iscsi.c
@@ -1377,7 +1377,7 @@ 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;
--
1.7.9.5
- [Qemu-devel] [PATCH] block/iscsi: allow cluster_size of 4K and greater,
Peter Lieven <=