[linux-lvm] [PATCH LVM2] (3/3) add 'cling' allocation policy

[Jun'ichi Nomura]

This patch adds 'cling' allocation policy.

Currently there are 3 policies: 'contiguous', 'normal', 'anywhere'.
LVM2 tries to apply from left to right until it succeeds allocation
or it failed to allocate with specified policy.

With this patch, policies are applied in the order:
'contiguous', 'cling', 'normal', 'anywhere'.

>From man page:
 The contiguous policy requires  that
 new extents are adjacent to existing extents. If there are sufficient
 free extents to satisfy an allocation request but  normal doesn't use them,
 anywhere will - even if that reduces performance by placing two stripes
 on the same physical volume.

'cling' policy requires that new extents are on the same physical
volume with the existing extents.

diffstat:
 include/metadata.h      |    1
 lib/display/display.c   |    1
 lib/metadata/lv_manip.c |   49 ++++++++++++++++++++++++++++++++++++++++++++---- lib/metadata/metadata.h |    1
 lib/report/report.c     |    2 +
 man/lvm.8               |    4 ++-
 6 files changed, 53 insertions(+), 5 deletions(-)

Thanks,
-- 
Jun'ichi Nomura, NEC Corporation of America

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