erasure-code: ErasureCode base class

Add the ErasureCode base class for ErasureCodeJerasure and
ErasureCodeIsa, for methods that can be shared among all plugins.

http://tracker.ceph.com/issues/8496 Fixes: #8496

Signed-off-by: Loic Dachary <loic@dachary.org>
erasure-code: move to ErasureCode::{encode,decode}{,chunk}

The bulk of ErasureCode{Jerasure,Isa}::encode and
ErasureCode{Jerasure,Isa}::decode is dealing with alignment and buffer
allocation. This is moved to ErasureCode::encode and ErasureCode::decode
respectively.

The jerasure/isa specific code is isolated in the new
ErasureCode{Jerasure,Isa}::encode_chunks and
ErasureCode{Jerasure,Isa}::decode_chunks virtual functions.

http://tracker.ceph.com/issues/8496 Refs: #8496

Signed-off-by: Loic Dachary <loic@dachary.org>
erasure-code: move to ErasureCode::minimum_to_decode*

The ErasureCode{Jerasure,Isa}::minimum_to_decode and
ErasureCode{Jerasure,Isa}::minimum_to_decode_with_cost methods are moved
verbatim to the ErasureCode base class.

http://tracker.ceph.com/issues/8496 Refs: #8496

Signed-off-by: Loic Dachary <loic@dachary.org>
erasure-code: move to ErasureCode::to_{int,bool}

The parameter parser helpers to_int and to_bool are moved from
ErasureCode{Jerasure,Isa} to ErasureCode.

The prototype is modified to return a status instead of the value. An
error ostream is provided as the last argument because ErasureCode
cannot use dout() or derr().

http://tracker.ceph.com/issues/8496 Refs: #8496

Signed-off-by: Loic Dachary <loic@dachary.org>
erasure-code: move to ErasureCode::decode_concat

It does not belong to ErasureCodeInterface which is supposed to not have
any implementation.

Signed-off-by: Loic Dachary <loic@dachary.org>
erasure-code: rework ErasureCode*::parse methods

The ErasureCode::parse virtual function is derived in
ErasureCode{Jerasure,Isa}. It is reworked to share parsing arguments the
various techniques have in common. The logic is otherwise unmodified.

http://tracker.ceph.com/issues/8496 Refs: #8496

Signed-off-by: Loic Dachary <loic@dachary.org>
rados: add {read,write}_ops to df json

Backport: firefly, dumpling
Signed-off-by: Sage Weil <sage@redhat.com>
when starting an OSD, pass in the cluster name

Signed-off-by: Alfredo Deza <alfredo.deza@inktank.com>
use  name in /var/lib/ceph paths

Signed-off-by: Alfredo Deza <alfredo.deza@inktank.com>
use cluster name when checking the host

Signed-off-by: Alfredo Deza <alfredo.deza@inktank.com>
os/FileStore: force any new xattr into omap on E2BIG

If we have a huge xattr (or many little ones), the _fgetattrs() for the
inline_set will fail with E2BIG.  The conditions later where we decide
whether to clean up the old xattr will then also fail.  We *will* put
the xattr in omap, but the non-omap version isn't cleaned up.

Fix this by setting a flag if we get E2BIG that the inline_set is known
to be incomplete.  In that case, take the conservative step of assuming
the xattr might be present and chain_fremovexattr().  Ignore any error
because it might not be there.

This is clearly harmless in the general case because it won't be there.
If it is, we will hopefully remove enough xattrs that the E2BIG
condition will go away (usually by removing some really big chained
xattr).

See original bug #7779.  With this in place, we can repair objects in
the broken state if we know the rados attr(s) that are responsible.
Usually that is user.rgw.manifset, and a rados get + set of the attr
will repair things.

Reviewed-by: Yehuda Sadeh <yehuda@inktank.com>
Reviewed-by: Samuel Just <sam.just@inktank.com>
Signed-off-by: Sage Weil <sage@redhat.com>
powerdns: Update README with better markdown
mds: Make min/max UID configurable for who is allowed to create a snapshot

This way administrators can configure which UIDs are allowed to create
snapshots on CephFS.

In certain situations it might be desirable that regular users are not allowed
to create snapshots. For example on shared hosting environments.

Fixes: #9029
allow passing a --cluster flag to the init script

It will fallback to looking at /etc/ceph/$cluster.conf
otherwise.

Signed-off-by: Alfredo Deza <alfredo.deza@inktank.com>
make ceph-disk use the new init flag for cluster

Signed-off-by: Alfredo Deza <alfredo.deza@inktank.com>
Merge remote-tracking branch 'gh/wip-filestore-bigxattr'
osd_types: s/stashed/rollback_info_completed and set on create

Originally, this flag indicated that the object had already been stashed and
that therefore recording subsequent changes is unecessary.  We want to set it
on create() as well since operations like [create, writefull] should not need
to stash the object.

Fixes: #8625
Signed-off-by: Samuel Just <sam.just@inktank.com>
OSD: fix wake_pg_waiters revert error in _open_lock_pg

231fe1b685bfbd3db9c81709ca39a29d696b13ad reintroduced erroneously
this call to wake_pg_waiters.  All _create_lock_pg callers handle
calling wake_pg_waiters after the pg lock has been dropped.

Fixes: #8691
Signed-off-by: Samuel Just <sam.just@inktank.com>
OSD: wake_pg_waiters outside of the pgmap write_lock, pg_lock

Signed-off-by: Samuel Just <sam.just@inktank.com>
OSD: rename session_waiting_for_map_lock to session_waiting_lock

This lock will also protect the waiting_for_pg structures in each
session.

Signed-off-by: Samuel Just <sam.just@inktank.com>