introduce virFileDirect API for block-friendly read/write

[libvirt RFC 0/5] introduce virFileDirect API for block-friendly read/write

Claudio Fontana posted 5 patches 1 year, 11 months ago

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git fetch https://github.com/patchew-project/libvirt tags/patchew/20220524104954.12315-1-cfontana@suse.de

src/libvirt_private.syms  |   8 +
src/qemu/qemu_saveimage.c | 269 ++++++++++++++++++++------------
src/qemu/qemu_saveimage.h |  20 ++-
src/util/virfile.c        | 316 +++++++++++++++++++++++++++++++++-----
src/util/virfile.h        |  11 ++
5 files changed, 476 insertions(+), 148 deletions(-)

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[libvirt RFC 0/5] introduce virFileDirect API for block-friendly read/write

Posted by Claudio Fontana 1 year, 11 months ago

As a spin-off from the previous multifd series,
this series offers a basic API for virfile.c to deal with reading and
writing files opened with O_DIRECT.

It applies this new API in the virFileDiskCopy code currently used
for iohelper, and reworks the saveimage code and on-disk lengths
to be O_DIRECT friendly.

This series is also available at:
https://gitlab.com/hw-claudio/libvirt.git "directio"

Gitlab successful pipeline is at:
https://gitlab.com/hw-claudio/libvirt/-/pipelines/546635704

Thank you for your feedback,

Claudio

Claudio Fontana (5):
  virfile: introduce virFileDirect APIs
  virfile: use virFileDirect API in runIOCopy
  qemu: saveimage: rework image read/write to be O_DIRECT friendly
  qemu: saveimage: assume future formats will also support compression
  virfile: virFileDiskCopy: prepare for O_DIRECT files without wrapper

 src/libvirt_private.syms  |   8 +
 src/qemu/qemu_saveimage.c | 269 ++++++++++++++++++++------------
 src/qemu/qemu_saveimage.h |  20 ++-
 src/util/virfile.c        | 316 +++++++++++++++++++++++++++++++++-----
 src/util/virfile.h        |  11 ++
 5 files changed, 476 insertions(+), 148 deletions(-)

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2.26.2