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[Qemu-devel] [RFC V2 01/20] qcow2: Add deduplication to the qcow2 specif
From: |
Benoît Canet |
Subject: |
[Qemu-devel] [RFC V2 01/20] qcow2: Add deduplication to the qcow2 specification. |
Date: |
Wed, 17 Oct 2012 18:00:10 +0200 |
---
docs/specs/qcow2.txt | 16 +++++++++++++++-
1 file changed, 15 insertions(+), 1 deletion(-)
diff --git a/docs/specs/qcow2.txt b/docs/specs/qcow2.txt
index 36a559d..013a16b 100644
--- a/docs/specs/qcow2.txt
+++ b/docs/specs/qcow2.txt
@@ -80,7 +80,10 @@ in the description of a field.
tables to repair refcounts before accessing the
image.
- Bits 1-63: Reserved (set to 0)
+ Bit 1: Deduplication bit. If this bit is set then
+ deduplication is used on this image.
+
+ Bits 2-63: Reserved (set to 0)
80 - 87: compatible_features
Bitmask of compatible features. An implementation can
@@ -116,6 +119,7 @@ be stored. Each extension has a structure like the
following:
0x00000000 - End of the header extension area
0xE2792ACA - Backing file format name
0x6803f857 - Feature name table
+ 0xCD8E819B - Deduplication
other - Unknown header extension, can be safely
ignored
@@ -159,6 +163,16 @@ the header extension data. Each entry look like this:
terminated if it has full length)
+== Deduplication ==
+
+The deduplication extension contains the offset and size of the deduplication
+table.
+
+ Byte 0 - 7: Offset
+
+ 8 - 11: Size
+
+
== Host cluster management ==
qcow2 manages the allocation of host clusters by maintaining a reference count
--
1.7.10.4
- [Qemu-devel] [RFC V2 00/20] QCOW2 deduplication, Benoît Canet, 2012/10/17
- [Qemu-devel] [RFC V2 03/20] qcow2: Add deduplication structures and fields., Benoît Canet, 2012/10/17
- [Qemu-devel] [RFC V2 06/20] qcow2: Add qcow2_dedup and related functions., Benoît Canet, 2012/10/17
- [Qemu-devel] [RFC V2 07/20] qcow2: Add qcow2_dedup_write_new_hashes., Benoît Canet, 2012/10/17
- [Qemu-devel] [RFC V2 08/20] qcow2: Implement qcow2_compute_cluster_hash., Benoît Canet, 2012/10/17
- [Qemu-devel] [RFC V2 09/20] qcow2: Add qcow2_co_load_dedup_hashes., Benoît Canet, 2012/10/17
- [Qemu-devel] [RFC V2 05/20] qcow2: Rename update_refcount into qcow2_update_refcount., Benoît Canet, 2012/10/17
- [Qemu-devel] [RFC V2 04/20] qcow2: Add qcow2_de dup_read_missing_and_concatenate, Benoît Canet, 2012/10/17
- [Qemu-devel] [RFC V2 15/20] block: Add dedup image create option., Benoît Canet, 2012/10/17
- [Qemu-devel] [RFC V2 01/20] qcow2: Add deduplication to the qcow2 specification.,
Benoît Canet <=
- [Qemu-devel] [RFC V2 17/20] qcow2: Integrate deduplication in qcow2_co_writev loop., Benoît Canet, 2012/10/17
- [Qemu-devel] [RFC V2 16/20] qcow2: Allow creation of images using deduplication., Benoît Canet, 2012/10/17
- [Qemu-devel] [RFC V2 10/20] qcow2: Add qcow2_dedup_grow_table., Benoît Canet, 2012/10/17
- [Qemu-devel] [RFC V2 12/20] qcow2: Extract qcow2_do_table_init., Benoît Canet, 2012/10/17
- [Qemu-devel] [RFC V2 20/20] qemu-iotests: Filter dedup=on/off so existing tests don't break., Benoît Canet, 2012/10/17
- [Qemu-devel] [RFC V2 13/20] qcow2: Add qcow2_dedup_init and qcow2_dedup_close., Benoît Canet, 2012/10/17
- [Qemu-devel] [RFC V2 18/20] qcow2: Add method to destroy the deduplication red black tree., Benoît Canet, 2012/10/17
- [Qemu-devel] [RFC V2 19/20] qcow2: init and cleanup deduplication., Benoît Canet, 2012/10/17