Re: [Qemu-devel] [PATCH V7 0/4] libqblock qemu block layer library

[wenchao xia]

于 2012-10-13 18:49, Blue Swirl 写道:
> On Sat, Oct 13, 2012 at 5:10 AM, Wenchao Xia <address@hidden> wrote:
>> From: Wenchao Xia <address@hidden>
>>
>>    These patches introduce libqblock API, make libqblock.la and make
>> check-libqblock could build this library.
>> Functionalities:
>>   1 create a new image.
>>   2 sync access of an image.
>>   3 basic image information retrieving such as backing file.
>>   4 detect if a sector is allocated in an image.
>> Supported Formats:
>>   ALL using file protocols.
>>
>> v2:
>>    Insert reserved bytes into union.
>>    Use uint64_t instead of size_t, offset.
>>    Use const char * in filename pointer.
>>    Initialization function removed and it was automatically executed when
>> library is loaded.
>>    Added compile flag visibility=hidden, to avoid name space pollution.
>>    Structure naming style changed.
>>    Using byte unit instead of sector for every API.
>>    Added a member in image static information structure, to report logical
>> sector size, which is always 512 now.
>>    Read and write API can take request not aligned to 512 now. It returns the
>> byte number that have succeed in operation, but now either negative value
>> or the number requested would be returned, because qemu block sync I/O API
>> would not return such number.
>>    Typo fix due to comments and improved documents.
>>
>> v3:
>>    Removed the code about OOM error, introduced GError.
>>    Used a table to map from string to enum types about format.
>>    Use typedef for every structure.
>>    Improved the gcc compiler macro to warn if gcc was not used.
>>    Global variable name changed with prefix libqb_.
>>    The struct QBlockStaticInfo was changed to folder full format related
>> information inside, and a new member with pointers pointing to the mostly 
>> used
>> members, such as backing file, virt size, was added. This would allow the 
>> user
>> to get full information about how it is created in the future.
>>    Each patch in the serial can work with qemu now.
>>    Typo fixes.
>>
>> v4:
>>    Renamed QBroker to QBlockContext.
>>    Removed tool objs out of libqblock.
>>    Added a check in initialization about structure size for ABI.
>>    Added a new helper API to duplicate protocol information, helps to open 
>> files
>> in a backing file chain.
>>    Check-libqblock will not rebuild libqblock every time now.
>>    Test case file renamed to "libqblock-[FMT].c".
>>    Test use gtest framework now.
>>    Test do random creation of test file now, added check for information API 
>> in
>> it.
>>    Test do random sync io instead of fixed offset io now.
>>    Test accept one parameter about where to place the test image, now it is
>> ./tests/libqblock/test_images.
>>
>> v5:
>>    Makefile of libqblock was adjusted to be similar as libcacard, added spec
>> file and install section.
>>    Removed warning when GCC was not found.
>>    Structure names were changed to better ones.
>>    Removed the union typedef that contain reserved bytes to reduce the folder
>> depth.
>>    Some format related enum options was changed to better name.
>>    Added accessors about image static information, hide indirect accessing
>> member detail in the structure.
>>    Test Makefile do not create diretory now, test case create it themself.
>>    Test build system do not use libtool now, and removed qtest-obj-y in its
>> dependency, make check will automatically execute test anyway now.
>>    Removed "ifeq ($(LIBTOOL),)" in Makefile.
>>
>> v6:
>>    Remove address pointer member in image static info structure.
>>
>> v7:
>>    Support out of tree building.
> 
> Still does not work:
>    lt CC libqblock/libqblock.lo
> In file included from /src/qemu/qemu-common.h:6,
>                   from /src/qemu/qemu-aio.h:17,
>                   from /src/qemu/block.h:4,
>                   from /src/qemu/libqblock/libqblock-internal.h:19,
>                   from /src/qemu/libqblock/libqblock.c:18:
> /src/qemu/compiler.h:6:25: error: config-host.h: No such file or directory
> 
  On my machine config-host.h was generated before in source code
directory, So I missed that. Fixed and tested again as following:
mkdir testbuild
cd testbuild
../configure
make libqblock
 Thanks for your sustained concern.

>>
>> Wenchao Xia (4):
>>    libqblock build system
>>    libqblock type defines
>>    libqblock API
>>    libqblock test example
>>
>>   .gitignore                        |    2 +
>>   Makefile                          |   14 +-
>>   block.c                           |    2 +-
>>   block.h                           |    1 +
>>   configure                         |    4 +-
>>   libqblock/Makefile                |   72 +++
>>   libqblock/libqblock-error.c       |   57 ++
>>   libqblock/libqblock-error.h       |   49 ++
>>   libqblock/libqblock-internal.h    |   75 +++
>>   libqblock/libqblock-types.h       |  252 ++++++++
>>   libqblock/libqblock.c             | 1191 
>> +++++++++++++++++++++++++++++++++++++
>>   libqblock/libqblock.h             |  341 +++++++++++
>>   libqblock/libqblock.pc.in         |   13 +
>>   tests/Makefile                    |   36 ++-
>>   tests/libqblock/libqblock-qcow2.c |  392 ++++++++++++
>>   15 files changed, 2496 insertions(+), 5 deletions(-)
>>   create mode 100644 libqblock/Makefile
>>   create mode 100644 libqblock/libqblock-error.c
>>   create mode 100644 libqblock/libqblock-error.h
>>   create mode 100644 libqblock/libqblock-internal.h
>>   create mode 100644 libqblock/libqblock-types.h
>>   create mode 100644 libqblock/libqblock.c
>>   create mode 100644 libqblock/libqblock.h
>>   create mode 100644 libqblock/libqblock.pc.in
>>   create mode 100644 tests/libqblock/libqblock-qcow2.c
>>
>>
>>
>