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[Qemu-devel] [PATCHv3 1.8 3/9] block/iscsi: set bdi->cluster_size
From: |
Peter Lieven |
Subject: |
[Qemu-devel] [PATCHv3 1.8 3/9] block/iscsi: set bdi->cluster_size |
Date: |
Wed, 27 Nov 2013 11:07:03 +0100 |
this patch aims to set bdi->cluster_size to the internal page size
of the iscsi target so that enabled callers can align requests
properly.
Reviewed-by: Paolo Bonzini <address@hidden>
Signed-off-by: Peter Lieven <address@hidden>
---
block/iscsi.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/block/iscsi.c b/block/iscsi.c
index 93fee6d..75d6b87 100644
--- a/block/iscsi.c
+++ b/block/iscsi.c
@@ -1580,6 +1580,13 @@ static int iscsi_get_info(BlockDriverState *bs,
BlockDriverInfo *bdi)
IscsiLun *iscsilun = bs->opaque;
bdi->unallocated_blocks_are_zero = !!iscsilun->lbprz;
bdi->can_write_zeroes_with_unmap = iscsilun->lbprz && iscsilun->lbp.lbpws;
+ /* 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 for bdi->cluster_size */
+ if (iscsilun->bl.opt_unmap_gran * iscsilun->block_size >= 64 * 1024 &&
+ iscsilun->bl.opt_unmap_gran * iscsilun->block_size <= 16 * 1024 *
1024) {
+ bdi->cluster_size = iscsilun->bl.opt_unmap_gran * iscsilun->block_size;
+ }
return 0;
}
--
1.7.9.5
- [Qemu-devel] [PATCHv3 1.8 0/9] qemu-img convert optimizations, Peter Lieven, 2013/11/27
- [Qemu-devel] [PATCHv3 1.8 2/9] qemu-img: fix usage instruction for qemu-img convert, Peter Lieven, 2013/11/27
- [Qemu-devel] [PATCHv3 1.8 3/9] block/iscsi: set bdi->cluster_size,
Peter Lieven <=
- [Qemu-devel] [PATCHv3 1.8 1/9] qemu-img: add support for skipping zeroes in input during convert, Peter Lieven, 2013/11/27
- [Qemu-devel] [PATCHv3 1.8 4/9] block: add opt_transfer_length to BlockLimits, Peter Lieven, 2013/11/27
- [Qemu-devel] [PATCHv3 1.8 5/9] block/iscsi: set bs->bl.opt_transfer_length, Peter Lieven, 2013/11/27
- [Qemu-devel] [PATCHv3 1.8 8/9] qemu-img: increase min_sparse to 128 sectors (64kb), Peter Lieven, 2013/11/27
- [Qemu-devel] [PATCHv3 1.8 6/9] qemu-img: dynamically adjust iobuffer size during convert, Peter Lieven, 2013/11/27
- [Qemu-devel] [PATCHv3 1.8 9/9] qemu-img: decrease progress update interval on convert, Peter Lieven, 2013/11/27
- [Qemu-devel] [PATCHv3 1.8 7/9] qemu-img: round down request length to an aligned sector, Peter Lieven, 2013/11/27