doc: update kernel recommendations, add tunables link

No 3.16.[0-2] - same rbd deadlock regression as in 3.15.

Signed-off-by: Ilya Dryomov <idryomov@redhat.com>
Merge pull request #2649 from ceph/wip-os-recommend-doc-fix

doc: update kernel recommendations, add tunables link
mds: typedefs for rank and gid in MDSMap

Make it clearer what these numbers are where they appear.

Signed-off-by: John Spray <john.spray@redhat.com>
messages: fix constness in MCommand constructor

Signed-off-by: John Spray <john.spray@redhat.com>
common: fix cmd_getval constness

...so that one can pass in a const cmdmap.

Signed-off-by: John Spray <john.spray@redhat.com>
mds: deprecation-warn on numeric mds names

To be turned into strict check in post-hammer
release, so that we can always unambiguously
discriminate a string into one of name, rank, gid.

Signed-off-by: John Spray <john.spray@redhat.com>
mds: handle MCommand (mds tell)

Separate path to legacy MMonCommand, because MCommand
from the CLI sends JSON-style commands.

Signed-off-by: John Spray <john.spray@redhat.com>
mds: introduce MDS auth caps

Signed-off-by: John Spray <john.spray@redhat.com>
osdc/Objecter: don't consume non-osd cmd replies

...so that Client can get command replies from MDSs.

Signed-off-by: John Spray <john.spray@redhat.com>
client: add mds_command operation

akin to Objecter::osd_command

Signed-off-by: John Spray <john.spray@redhat.com>
libcephfs: add ceph_mds_command

Wraps the equivalent fn in Client.

Signed-off-by: John Spray <john.spray@redhat.com>
pybind/rados: add conf/conf_defaults attributes

Store these from initialization so that given a Rados
object, we can read back config to initialize a
LibCephFS object.

Signed-off-by: John Spray <john.spray@redhat.com>
pybind/cephfs: implement conf_parse_argv

So that when using `ceph` we can pass through
--debug-x args etc.

Signed-off-by: John Spray <john.spray@redhat.com>
pybind/cephfs: implement mds_command

Signed-off-by: John Spray <john.spray@redhat.com>
pybind/ceph_argparse: implement 'tell mds'

Signed-off-by: John Spray <john.spray@redhat.com>
mds: fix MDSAuthCap when cephx is disabled

Signed-off-by: John Spray <john.spray@redhat.com>
vstart: mds * auth caps

...so that the default client.admin identity
can call 'tell mds' things.

Signed-off-by: John Spray <john.spray@redhat.com>
vstart: create fewer pgs for fs pools

Just so that dev clusters come up more
quickly.

Signed-off-by: John Spray <john.spray@redhat.com>
test: unit tests for MDSAuthCaps

Signed-off-by: John Spray <john.spray@redhat.com>
qa: fixup cephtool test when MDS exists

We added MDS resetting code here a while back,
but the order of operations was such that a
"cluster up" was being run between a fail_all_mds
and the point at which we needed the map not to
be interfered with (testing setmap).

Also the new fs create/destroy cycles for testing
EC pool handling were missing calls to stop the
daemons before fs rm.

Signed-off-by: John Spray <john.spray@redhat.com>