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[Qemu-devel] [PULL 24/32] docs/qcow2: Correct refcount_block_entries
From: |
Kevin Wolf |
Subject: |
[Qemu-devel] [PULL 24/32] docs/qcow2: Correct refcount_block_entries |
Date: |
Thu, 23 Oct 2014 22:42:31 +0200 |
From: Max Reitz <address@hidden>
A refblock entry may have a different size than 16 bits, it may even be
smaller than a byte. Correct the refcount_block_entries calculation
accordingly.
Signed-off-by: Max Reitz <address@hidden>
Signed-off-by: Kevin Wolf <address@hidden>
---
docs/specs/qcow2.txt | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/docs/specs/qcow2.txt b/docs/specs/qcow2.txt
index cfbc8b0..0a878aa 100644
--- a/docs/specs/qcow2.txt
+++ b/docs/specs/qcow2.txt
@@ -183,7 +183,7 @@ blocks and are exactly one cluster in size.
Given a offset into the image file, the refcount of its cluster can be obtained
as follows:
- refcount_block_entries = (cluster_size / sizeof(uint16_t))
+ refcount_block_entries = (cluster_size * 8 / refcount_bits)
refcount_block_index = (offset / cluster_size) % refcount_block_entries
refcount_table_index = (offset / cluster_size) / refcount_block_entries
--
1.8.3.1
- [Qemu-devel] [PULL 14/32] qcow2: Let inc_refcounts() return -errno, (continued)
- [Qemu-devel] [PULL 14/32] qcow2: Let inc_refcounts() return -errno, Kevin Wolf, 2014/10/23
- [Qemu-devel] [PULL 16/32] qcow2: Reuse refcount table in calculate_refcounts(), Kevin Wolf, 2014/10/23
- [Qemu-devel] [PULL 15/32] qcow2: Let inc_refcounts() resize the reftable, Kevin Wolf, 2014/10/23
- [Qemu-devel] [PULL 17/32] qcow2: Fix refcount blocks beyond image end, Kevin Wolf, 2014/10/23
- [Qemu-devel] [PULL 18/32] qcow2: Do not perform potentially damaging repairs, Kevin Wolf, 2014/10/23
- [Qemu-devel] [PULL 20/32] qcow2: Clean up after refcount rebuild, Kevin Wolf, 2014/10/23
- [Qemu-devel] [PULL 19/32] qcow2: Rebuild refcount structure during check, Kevin Wolf, 2014/10/23
- [Qemu-devel] [PULL 21/32] iotests: Fix test outputs, Kevin Wolf, 2014/10/23
- [Qemu-devel] [PULL 22/32] iotests: Add test for potentially damaging repairs, Kevin Wolf, 2014/10/23
- [Qemu-devel] [PULL 23/32] qcow2: Drop REFCOUNT_SHIFT, Kevin Wolf, 2014/10/23
- [Qemu-devel] [PULL 24/32] docs/qcow2: Correct refcount_block_entries,
Kevin Wolf <=
- [Qemu-devel] [PULL 25/32] docs/qcow2: Limit refcount_order to [0, 6], Kevin Wolf, 2014/10/23
- [Qemu-devel] [PULL 27/32] qemu-io: Respect early image end for map, Kevin Wolf, 2014/10/23
- [Qemu-devel] [PULL 28/32] iotests: Add test for map commands, Kevin Wolf, 2014/10/23
- [Qemu-devel] [PULL 30/32] iotests: Add test for qcow2 L1 table update, Kevin Wolf, 2014/10/23
- [Qemu-devel] [PULL 29/32] qcow2: Do not overflow when writing an L1 sector, Kevin Wolf, 2014/10/23
- [Qemu-devel] [PULL 26/32] block: Respect underlying file's EOF, Kevin Wolf, 2014/10/23
- [Qemu-devel] [PULL 31/32] block: char devices on FreeBSD are not behind a pager, Kevin Wolf, 2014/10/23
- [Qemu-devel] [PULL 32/32] qemu-img: Print error if check failed, Kevin Wolf, 2014/10/23
- Re: [Qemu-devel] [PULL 00/32] Block patches, Peter Maydell, 2014/10/24