[Libguestfs] [PATCH 0/3] file: Zero for block devices and older file systems

[Nir Soffer]

On Thu, Aug 2, 2018 at 10:06 PM Nir Soffer <nirsof at gmail.com> wrote:

> This is the second version to support efficient zero for block devices
> on older kernels (e.g. RHEL 7.5), and file systems that do not support
> yet FALLOC_FS_ZERO_RANGE (e.g. NFS 4.2).
>
> Changes since v1:
> - Split to smaller patches
> - Skip linux only includes on other systems
> - Skip code using BLKZEROOUT if the macro is not defined
> - Try BLKZEROOUT only if the offset and count are aligned to device
>   sector size.
>

Other changes I forgot to mention (interrupted by a child):
- initialize h->can_* properly. Before they were uninitialized if
FALLOC_FL_*
  macros were not defined.
- Use new h->can_punch_hole in file_can_trim, so now we report the actual
  capability once we detected it.
- Use h->can_punch_hole in file_trim, so we try only once if the operation
is not
  supported.


> v1 was here:
> https://www.redhat.com/archives/libguestfs/2018-July/msg00084.html
>
> Nir Soffer (3):
>   file: Avoid unsupported fallocate() calls
>   file: Support zero without ZERO_RANGE
>   file: Zero for block devices on old kernels
>
>  plugins/file/file.c | 194 +++++++++++++++++++++++++++++++++-----------
>  1 file changed, 147 insertions(+), 47 deletions(-)
>
> --
> 2.17.1
>
>
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