[Qemu-devel] [PATCH V4 0/5] libqblock qemu block layer library

[Wenchao Xia <xiawenc@linux.vnet.ibm.com>]

  This patch 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.

Wenchao Xia (5):
  libqblock build system
  libqblock type defines
  libqblock API
  libqblock test build system
  libqblock test example

 .gitignore                        |    2 +
 Makefile                          |   15 +-
 Makefile.objs                     |    6 +
 block.c                           |    2 +-
 block.h                           |    1 +
 libqblock/Makefile                |   56 ++
 libqblock/libqblock-error.c       |   57 ++
 libqblock/libqblock-error.h       |   49 ++
 libqblock/libqblock-internal.h    |   57 ++
 libqblock/libqblock-types.h       |  268 +++++++++
 libqblock/libqblock.c             | 1165 +++++++++++++++++++++++++++++++++++++
 libqblock/libqblock.h             |  308 ++++++++++
 tests/Makefile                    |   45 ++
 tests/libqblock/libqblock-qcow2.c |  368 ++++++++++++
 14 files changed, 2396 insertions(+), 3 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 tests/libqblock/libqblock-qcow2.c