On Thu, Dec 14, 2023 at 13:26:35 +0100, Ján Tomko wrote:
> On a Thursday in 2023, Peter Krempa wrote:
> > Allow users to easily resize 'raw' images on block devices to the full
> > capacity of the block device. Obviously this won't work on file-backed
> > storage (filling the remaining capacity is most likely wrong) or for
> > formats with metadata due to the overhead.
> >
> > Signed-off-by: Peter Krempa <[email protected]>
> > ---
> > docs/manpages/virsh.rst | 6 +++++-
> > include/libvirt/libvirt-domain.h | 1 +
> > src/libvirt-domain.c | 5 +++++
> > tools/virsh-domain.c | 10 +++++++++-
> > 4 files changed, 20 insertions(+), 2 deletions(-)
> >
> > diff --git a/tools/virsh-domain.c b/tools/virsh-domain.c
> > index fa9d356e15..327553f6d7 100644
> > --- a/tools/virsh-domain.c
> > +++ b/tools/virsh-domain.c
> > @@ -2949,9 +2949,12 @@ static const vshCmdOptDef opts_blockresize[] = {
> > },
> > {.name = "size",
> > .type = VSH_OT_INT,
> > - .flags = VSH_OFLAG_REQ,
> > .help = N_("New size of the block device, as scaled integer (default
> > KiB)")
> > },
> > + {.name = "capacity",
> > + .type = VSH_OT_BOOL,
> > + .help = N_("resize to capacity of source (block device)")
> > + },
> > {.name = NULL}
> > };
> >
> > @@ -2963,6 +2966,11 @@ cmdBlockresize(vshControl *ctl, const vshCmd *cmd)
> > unsigned long long size = 0;
> > unsigned int flags = 0;
> >
> > + VSH_ALTERNATIVE_OPTIONS("size", "capacity");
> > +
> > + if (vshCommandOptBool(cmd, "capacity"))
> > + flags |= VIR_DOMAIN_BLOCK_RESIZE_CAPACITY;
> > +
>
> Below, there's some silly code that runs (or gets optimized away) even if
> size wasn't
> specified:
>
> /* Prefer the older interface of KiB. */
> if (size % 1024 == 0)
> size /= 1024;
>
> Avoiding it for the --capacity flag would probably require separate bool
> variables. That would negate the need for the new macro.
You can also do:
- /* Prefer the older interface of KiB. */
- if (size % 1024 == 0)
- size /= 1024;
- else
- flags |= VIR_DOMAIN_BLOCK_RESIZE_BYTES;
+ if (vshCommandOptBool(cmd, "capacity")) {
+ flags |= VIR_DOMAIN_BLOCK_RESIZE_CAPACITY;
+ } else {
+ /* Prefer the older interface of KiB. */
+ if (size % 1024 == 0)
+ size /= 1024;
+ else
+ flags |= VIR_DOMAIN_BLOCK_RESIZE_BYTES;
+ }
I'll go with this version although it's a bit pointless either way.
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