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Some of the error interface is still TBD. Rather than exporting a lot
of codes, etc, just use a simple pass / fail. The allows our unit test
to not segfault if trying to create a VG that already exists.
lvm_vg_open() calls internal vg_read() function which is the entry point
for reading an existing VG. In addition to the mode, we include a 'flags'
parameter for future extensions.
Signed-off-by: Dave Wysochanski <dwysocha@redhat.com>
Add some liblvm APIs for VGs. Most of these APIs simply call into the internal
liblvm library. Ideally we should call the liblvm functions directly from
the tools. However, until we convert more of the code to liblvm functions,
things like the cmd_context will get in the way. For now just implement the
liblvm functions as wrappers around the internal functions, with a little
error checking and return code handling. We put all these vg APIs into a
new file, lvm_vg.c
The following APIs are implemented:
lvm_vg_create, lvm_vg_extend, lvm_vg_set_extent_size, lvm_vg_write,
lvm_vg_remove, lvm_vg_close.
Still TODO:
- cleanup error handling by using lvm_errno() and related APIs
- cleanup naming / clarify which functions commit to disk vs not
- implement more 'set' functions
- decide on 'set' / 'change' nomenclature
Signed-off-by: Dave Wysochanski <dwysocha@redhat.com>
Acked-by: Alasdair G Kergon <agk@redhat.com>
