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and further reduce the number of ioctl calls made.
o Metadata area struct change.
o Make config file accessible to activation functions & get stripe_filler
from it.
o Allow kernel to return snapshot status as a fraction or a percentage.
Clear many compiler warnings (i386) & associated bugs - hopefully without
introducing too many new bugs:-) (Same exercise required for other archs.)
Default compilation has optimisation - or else use ./configure --enable-debug
preparsed status info, shove it all into a string, and then parse it
again to get the info back out (which is what i was doing before)
o basically that's it...i like this *much* better than the previous
method and i think it makes the _status fxn more flexible if we need
to use it to get other info out.
o Not sure if the code in dev_manager is really optimal, but it works..
will look at adjusting it a bit now.
o I *think* it works right when one snapshot if full but others aren't,
but I haven't really been able to test it because the full snapshot
somehow resets itself and weird things start happening to the system...
Lots of changes/very little testing so far => there'll be bugs!
Use 'vgcreate -M text' to create a volume group with its metadata stored
in text files. Text format metadata changes should be reasonably atomic,
with a (basic) automatic recovery mechanism if the system crashes while a
change is in progress.
Add a metadata section to lvm.conf to specify multiple directories if
you want (recommended) to keep multiple copies of the metadata (eg on
different filesystems).
e.g. metadata {
dirs = ["/etc/lvm/metadata1","/usr/local/lvm/metadata2"]
}
Plenty of refinements still in the pipeline.
from lock_vol() - otherwise it now attempts to acquire the lock and then
immediately releases it.
o Extend the id field in struct logical_volume to hold VG uuid + LV uuid
for format1. This unique lvid can be used directly when calling lock_vol().
o Add the VG uuid to vgcache to make VG uuid lookups possible. (Another
step towards using them instead of VG names internally.)
