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Re: [Qemu-devel] [RFC V3 00/24] QCOW2 deduplication
From: |
Stefan Hajnoczi |
Subject: |
Re: [Qemu-devel] [RFC V3 00/24] QCOW2 deduplication |
Date: |
Tue, 11 Dec 2012 15:19:22 +0100 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Mon, Nov 26, 2012 at 02:04:59PM +0100, Benoît Canet wrote:
> This patchset is the first working version of the QCOW2 deduplication.
>
> Images must be created with "-o dedup=on" in order to activate the
> deduplication in the image.
>
>
> Since v2: make it work barely
> replace kernel red black trees by gtree.
>
> Benoît Canet (24):
> qcow2: Add deduplication to the qcow2 specification.
> qcow2: Add deduplication structures and fields.
> qcow2: Add qcow2_dedup_read_missing_and_concatenate
> qcow2: Make update_cluster_refcount public.
> qcow2: Create a way to link to l2 tables in dedup.
> qcow2: Add qcow2_dedup and related functions.
> qcow2: Add qcow2_dedup_write_new_hashes.
> qcow2: Implement qcow2_compute_cluster_hash.
> qcow2: Extract qcow2_dedup_grow_table
> qcow2: create function to load deduplication hashes at startup.
> qcow2: Load and save deduplication table header extension.
> qcow2: Extract qcow2_do_table_init.
> qcow2: Add qcow2_dedup_init and qcow2_dedup_close.
> qcow2: Extract qcow2_add_feature and qcow2_remove_feature.
> block: Add dedup image create option.
> qcow2: Allow creation of images using deduplication.
> qcow2: Behave correctly when refcount reach 0 or 2^16.
> qcow2: Integrate deduplication in qcow2_co_writev loop.
> qcow2: Add verification of dedup table.
> qcow2: Adapt checking of QCOW_OFLAG_COPIED for dedup.
> qcow2: Add check_dedup_l2 in order to check l2 of dedup table.
> qcow2: Do not overwrite existing entries with QCOW_OFLAG_COPIED.
> qcow2: init and cleanup deduplication.
> qemu-iotests: Filter dedup=on/off so existing tests don't break.
>
> Makefile | 3 +
> Makefile.target | 2 +-
> block/Makefile.objs | 1 +
> block/qcow2-cluster.c | 115 ++++--
> block/qcow2-dedup.c | 914
> ++++++++++++++++++++++++++++++++++++++++++
> block/qcow2-refcount.c | 154 +++++--
> block/qcow2.c | 267 ++++++++++--
> block/qcow2.h | 89 +++-
> block_int.h | 1 +
> docs/specs/qcow2.txt | 33 +-
> tests/qemu-iotests/common.rc | 3 +-
> 11 files changed, 1480 insertions(+), 102 deletions(-)
> create mode 100644 block/qcow2-dedup.c
$ make check
LINK tests/test-coroutine
/usr/bin/ld: block/qcow2-dedup.o: undefined reference to symbol
'EVP_sha256@@libcrypto.so.10'
/usr/bin/ld: note: 'EVP_sha256@@libcrypto.so.10' is defined in DSO
/lib64/libcrypto.so.10 so try adding it to the linker command line
/lib64/libcrypto.so.10: could not read symbols: Invalid operation
collect2: error: ld returned 1 exit status
make: *** [tests/test-coroutine] Error 1
- Re: [Qemu-devel] [RFC V3 00/24] QCOW2 deduplication,
Stefan Hajnoczi <=