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This should be a rare occurrence so the aim is to recover if it's
straightforward to do so, otherwise just to abort the operation.
If people *knowingly* change device names, they should always run vgscan
afterwards.
A few bytes of memory gets leaked inside a pool each time an alias
has to be discarded - it's not worth restructuring the code to reuse it.
More of LVM2 needs updating to pass device objects (or uuids) about
instead of pathnames so that resolution of pathname->object only happens
once per operation.
dev_cache_get() should now always return the *current* device at the path given
dev_name_confirmed() replaces dev_name() whenever it's important to
know that name for the device is still current (ie when opening it).
If the cache doesn't know a current name, the function fails.
dev_open() guarantees that the file descriptor returned is for the dev_t
of the device structure it was passed.
o When opening device, return error if its cached name is incorrect (eg if
it's changed since the cache was generated). This prevents use until
the cache is rebuilt (eg with vgscan). Doesn't catch every case.
o Changed disk-rep to use these
o if NDEBUG is not defined the dev_cache will check for open devices on
teardown.
I was hoping this would speed things up. But I'm still getting:
reti:/home/joe/sistina/LVM2/tools# time ./lvm vgchange -a n
Volume group vg0 successfully changed
real 0m5.751s
user 0m0.060s
sys 0m0.070s
even though I have only 1 device with the vg on it passing the filters.
