ceph-disk: Enable creating multiple osds per dev

This is useful for demos and testing.  Enables
creation of lots of OSDs on a single block device
by simply running ceph-disk prepare more than once,
with a --data-size argument set.

Signed-off-by: John Spray <john.spray@inktank.com>
ceph-objectstore-test: fix warning in collect_metadata test

In file included from test/objectstore/store_test.cc:33:0:
../src/gtest/include/gtest/gtest.h: In function ‘testing::AssertionResult testing::internal::CmpHelperNE(const char*, const char*, const T1&, const T2&) [with T1 = long unsigned int, T2 = int]’:
test/objectstore/store_test.cc:82:5: instantiated from here
warning: ../src/gtest/include/gtest/gtest.h:1379:1: comparison between signed and unsigned integer expressions [-Wsign-compare]

Signed-off-by: Sage Weil <sage@inktank.com>
include/atomic: make 32-bit atomic64_t unsigned

This fixes

In file included from test/perf_counters.cc:19:0:
./common/perf_counters.h: In member function ‘std::pair PerfCounters::perf_counter_data_any_d::read_avg() const’:
warning: ./common/perf_counters.h:156:36: comparison between signed and unsigned integer expressions [-Wsign-compare]
} while (avgcount2.read() != count);
^

Signed-off-by: Sage Weil <sage@inktank.com>
Merge pull request #1925 from ceph/wip-i386-atomic

fix i386 atomic64_t

Reviewed-by: Samuel Just <sam.just@inktank.com>
Merge remote-tracking branch 'gh/next'
Merge pull request #1859 from ceph/wip-multipartition

ceph-disk: Enable creating multiple osds per dev

Reviewed-by: Dan Mick <dan.mick@inktank.com>
OSD::calc_priors_during: handle CRUSH_ITEM_NONE correctly

Fixes: #8507
Signed-off-by: Samuel Just <sam.just@inktank.com>
Merge remote-tracking branches 'origin/wip-7999', 'origin/wip-8396' and 'origin/wip-8507' into wip-sam-testing-2