Re: [linux-lvm] libLVM progress?

["Bryn M. Reeves" <breeves@redhat.com>]

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Ken Stein wrote:
> * use system() or exec() style calls to run the command line LVM utilities
> as needed.  Works, but not exactly elegant, and definitely not efficient.

You'd be better off using the existing liblvm2cmd library. This gives
you a programmatic interface to the command line toolset. It will still
mean formatting commandlines/parsing returns but it cuts down on your
forking and allows the library to cache LVM2 internal data across
command invocations - potentially, that amounts to a big saving.

See doc/example_cmdlib.c in the LVM2 sources for a short example program.

> * delve deeply into the LVM utilities source code to find the ioctl calls
> and/or procfs+sysfs structures being used, then duplicate this in my own
> work.

Not a good idea - there's too much complexity involved and duplicating
that in separate projects would lead to something pretty unmaintainable
quite quickly.

> * use a premade LVM interface library.

There is work in progress to create this kind of interface.

Cheers,
Bryn.

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