mgr/influx: Only fetch the current time once when gathering data

By fetching the current time once and storing it into a variable
we save a lot of system calls. On large clusters this can be a lot
of system calls.

In addition we also make sure that all points gathered in the same
loop/run have exactly the same timestamp.

Otherwise there will be a difference in time between the items in
InfluxDB which then causes problems when creating graphs with for
example Grafana.

Signed-off-by: Wido den Hollander <wido@42on.com>
(cherry picked from commit 0857d3bcd4175f39582376fb9980cf3f66fa09ce)

mgr/influx: Send more information about pools

In addition to the existing statistics also send Read and Write IOps,
but also quota information.

Signed-off-by: Wido den Hollander <wido@42on.com>
(cherry picked from commit c803f38a17af625edc1cee29f21e510a03396204)

mgr/influx: Catch ConnectionError if raised

The InfluxDBClient can also re-raise a ConnectionError from the
python requests module if that was caught.

The Exception might be:

  ConnectionError: ('Connection aborted.', error(104, 'Connection reset by peer'))

Catch and log this error instead of having it raised which might
cause problems further down.

Signed-off-by: Wido den Hollander <wido@42on.com>
(cherry picked from commit a0c2c8b900cd2bab2ef8041722036036efd2cb0f)

Add InfluxDB SSL Option

Add possibility to connect to InfluxDB via https.
Also adding the option for verifying the https cert.

Signed-off-by: Tobias Gall <tobias.gall@mailbox.org>
(cherry picked from commit f5efaa2f522b7cc7497db1d5a82785e7f08b7bb0)

mgr/influx: Print (in debug) time it takes to send data to Influx

On large clusters it might take a very long time to send data to Influx
due to the gathering and parsing of statistics.

By keeping a counter and printing it admins can adjust the interval if it
becomes to heavy for their cluster.

Signed-off-by: Wido den Hollander <wido@42on.com>
(cherry picked from commit 3f07636bc235ace8da3f2f07aefd56e53085ea0e)

mgr/influx: Revise configuration of module

It's a lot like the Zabbix module and allows for setting configuration
options on run-time and also fetch them from the module.

A few additional commands have been registered to make sure it is easy
to interact with the module.

Signed-off-by: Wido den Hollander <wido@42on.com>
(cherry picked from commit 429718af1cb30de49e8c7550b04bd788010ba1a4)

mgr/influx: Send fsid as a tag to Influx to identify cluster

This allows for multiple Ceph clusters to send their data to the
same Influx database.

Using the fsid values for different clusters can be queried from
Influx

Signed-off-by: Wido den Hollander <wido@42on.com>
(cherry picked from commit 2b71a8919c705834d9e669731c2ac83c52715b5b)

mgr/influx: PEP-8 fixes to InfluxDB module

The code now scores:

  Your code has been rated at 8.94/10

Various indentation fixes, whitespaces and other PEP-8 related changes

Signed-off-by: Wido den Hollander <wido@42on.com>
(cherry picked from commit 9440be3da292b98739bc8362d82b1e86b831d50b)

Merge pull request #21699 from jcsp/wip-mgr-doc-bal-luminous

luminous: doc/mgr/balancer: document

Reviewed-By: Sage Weil <sage@redhat.com>

Merge pull request #22375 from dzafman/wip-scrub-omap-luminous

Reviewed-by: Kefu Chai <kchai@redhat.com>

Merge pull request #21187 from smithfarm/wip-23157-luminous

luminous: mds: underwater dentry check in CDir::_omap_fetched is racy

Merge pull request #21278 from batrick/i22696

luminous: client: dirty caps may never get the chance to flush

mds: fix check of underwater dentries

Underwater dentry is dentry that is dirty in our cache from journal
replay, but had already been flushed to disk before the mds failed.
To decide if an dentry is underwater, original code compares dirty
dentry's version to on-disk dirfrag's version. This method is racy
because CDir::log_mark_dirty() can increase dirfrag's version without
adding log event. After mds failover, version of dirfrag from journal
replay can be less than on-disk dirfrag's version. So newly dirtied
dentry can be equal to or less than the on-disk dirfrag's version.

The race can cause incorrect fragstat/rstat

Fixes: http://tracker.ceph.com/issues/23032
Signed-off-by: Yan, Zheng <zyan@redhat.com>
(cherry picked from commit 9d271696b7735ab5b7384cdd386d6ac3eaafe437)

Conflicts:
src/mds/CDir.cc - conditional being replaced by "if (!dn)" is different
                          in luminous

client: make mark_caps_clean and mark_caps_dirty as member function to Inode

Signed-off-by: dongdong tao <tdd21151186@gmail.com>
(cherry picked from commit 06ce613779a810dd979cb2eb15b510131a81fd74)

client: fix dirty caps might never be flushed

Fixes: http://tracker.ceph.com/issues/22546
Signed-off-by: dongdong tao <tdd21151186@gmail.com>
(cherry picked from commit aeb920be8ab5f0e5e47d82943c214b012bb8ec5c)

Conflicts:
src/client/Client.cc

Merge pull request #22258 from yuriw/wip-yuriw-fix-luminous

luminous: qa/tests: added missed ubuntu_latest

Merge pull request #21475 from pdvian/wip-23704-luminous

luminous: fuse: wire up fuse_ll_access

Merge pull request #22119 from pdvian/wip-24049-luminous

luminous: ceph-fuse: missing dentries in readdir result

Merge branch 'luminous' into wip-24049-luminous

Merge branch 'luminous' into wip-23704-luminous

Merge pull request #21495 from pdvian/wip-23770-luminous

luminous: ceph-fuse: return proper exit code

Merge pull request #22176 from pdvian/wip-24107-luminous

luminous: mds: set could_consume to false when no purge queue item actually exe…

Merge pull request #22310 from ukernel/luminous-24341

luminous: mds: fix some memory leak

Merge pull request #22271 from pdvian/wip-24205-luminous

luminous: mds: broadcast quota to relevant clients when quota is explicitly set

Merge pull request #22221 from pdvian/wip-24201-luminous

luminous: client: fix issue of revoking non-auth caps

Merge pull request #22208 from pdvian/wip-24188-luminous

luminous: kceph: umount on evicted client blocks forever

Merge pull request #22171 from ukernel/luminous-24108

luminous: mds: avoid calling rejoin_gather_finish() two times successively

Merge pull request #22168 from ukernel/luminous-24207

luminous: client: avoid freeing inode when it contains TX buffer head

Merge pull request #22118 from pdvian/wip-24050-luminous

luminous: mds: include nfiles/nsubdirs of directory inode in MClientCaps

Merge pull request #22018 from batrick/i23991

luminous: client: hangs on umount if it had an MDS session evicted

Merge pull request #21990 from batrick/i23935

luminous: mds: don't discover inode/dirfrag when mds is in 'starting' state

Merge pull request #21989 from batrick/i24130

luminous: mds: handle imported session race

Merge pull request #21922 from pdvian/wip-23984-luminous

luminous: mds: mark new root inode dirty

Merge pull request #21921 from pdvian/wip-23982-luminous

luminous: qa: fix blacklisted check for test_lifecycle

Merge pull request #21901 from pdvian/wip-23951-luminous

luminous: mds: kick rdlock if waiting for dirfragtreelock

Merge pull request #21900 from pdvian/wip-23946-luminous

luminous: mds: crash when failover

Merge pull request #21874 from pdvian/wip-23936-luminous

luminous: cephfs-journal-tool: wait prezero ops before destroying journal

Merge pull request #21841 from pdvian/wip-23931-luminous

luminous: qa: remove racy/buggy test_purge_queue_op_rate

Merge pull request #21730 from joscollin/wip-23933-luminous

luminous: client: avoid second lock on client_lock

Merge pull request #21617 from pdvian/wip-23835-luminous

luminous: mds: fix occasional dir rstat inconsistency between multi-MDSes

Merge pull request #21600 from joscollin/wip-23475-luminous

luminous: ceph-fuse: trim ceph-fuse -V output

Merge pull request #21616 from joscollin/wip-23308-luminous

luminous: doc: Fix -d description in ceph-fuse

Merge pull request #21899 from pdvian/wip-23950-luminous

luminous: mds: trim log during shutdown to clean metadata

Merge pull request #21589 from pdvian/wip-23818-luminous

luminous: client: add client option descriptions

Merge pull request #21687 from batrick/i23638

luminous: ceph-fuse: getgroups failure causes exception

osd: Handle omap and data digests independently

Caused by: be078c8b7b131764caa28bc44452b8c5c2339623
The original attempt above to fix the omap_digest handling when
data_digest isn't present had 2 errors.  First, it checked
is_data_digest() and is_omap_digest() instead of digest_present and
omap_digest_present which indicate the source digest is available.
Second, MAYBE could only be set if both digests are available.

Fixes: http://tracker.ceph.com/issues/24366
Signed-off-by: David Zafman <dzafman@redhat.com>
(cherry picked from commit 01f9669928abd571e14421a51a749d44fa041337)

cleanup: Remove debug option osd_debug_scrub_chance_rewrite_digest

This option seems pointless and there are no test cases that use it.

Signed-off-by: David Zafman <dzafman@redhat.com>
(cherry picked from commit 6adeaed32f70923d012bf9410bfa8651694be3cf)

osd/PrimaryLogPG: do not set data/omap digest blindly

As bluestore has bulitin csum, we generally no longer generate
object data digest for now. The consequence is that we should
handle data/omap digest more carefully to make certain ops,
such as copy_from/promote, to work properly since they heavily
relies on data digest for data transfer correctness.

Example of failure:
http://pulpito.ceph.com/xxg-2017-09-30_11:46:34-rbd-master-distro-basic-mira/1690609/

Signed-off-by: xie xingguo <xie.xingguo@zte.com.cn>
(cherry picked from commit be078c8b7b131764caa28bc44452b8c5c2339623)

Conflicts:
src/osd/PrimaryLogPG.cc (still have snapdir)

client: fix error operator precedence

    /home/pdonnell/ceph/src/client/Client.cc: In member function ‘int Client::mount(const string&, const UserPerm&, bool)’:
    /home/pdonnell/ceph/src/client/Client.cc:5681:23: warning: suggest parentheses around ‘+’ inside ‘<<’ [-Wparentheses]
        return CEPH_FUSE_NO_MDS_UP;
                    ~~^~

Found by gcc. I am ashamed.

Signed-off-by: Patrick Donnelly <pdonnell@redhat.com>
(cherry picked from commit 75f980d85256e22b7b79e5f64bfa3fc6018328b5)

ceph-fuse: exit with failure on failed mount

Fixes: https://tracker.ceph.com/issues/23665
Signed-off-by: Patrick Donnelly <pdonnell@redhat.com>
(cherry picked from commit 7740fcde942603750029322ad2c16c18a7b546ab)

Conflicts:
src/ceph_fuse.cc : Resolved in main

common: ignore errors during preforker exit

Caller can't do anything useful and it obsecures the error the caller wants to
return.

Signed-off-by: Patrick Donnelly <pdonnell@redhat.com>
(cherry picked from commit 3f0b7d96f5cb96ff61c935777671ab7ddd94cfd3)

client: do not overload system errnos

Signed-off-by: Patrick Donnelly <pdonnell@redhat.com>
(cherry picked from commit 26f717361ea025462bc8016aca5a7c130048e769)

mds: trim log during shutdown to clean metadata

Otherwise the trimming won't advance so that the remaining inodes are marked
clean.

Fixes: http://tracker.ceph.com/issues/23923
Signed-off-by: Patrick Donnelly <pdonnell@redhat.com>
(cherry picked from commit c60ef1b806c4a0c60362193675990447d82a65f4)

Merge pull request #22191 from alfredodeza/backport-wip-cv-ansible-deps

lumionus ceph-volume tests.functional install new ceph-ansible dependencies

Reviewed-by: Andrew Schoen <aschoen@redhat.com>

mds: fix leak of MDSCacheObject::waiting

Fixes: http://tracker.ceph.com/issues/24289
Signed-off-by: "Yan, Zheng" <zyan@redhat.com>
(cherry picked from commit 8f3c8bf6eafd3545c3c786b8520e8ff2c40af2a0)

mds: fix some memory leak

Fixes: http://tracker.ceph.com/issues/24289
Signed-off-by: "Yan, Zheng" <zyan@redhat.com>
(cherry picked from commit e7c149b93dc384ee4a2c8250c502548d12535123)

mds: broadcast quota to relevant clients when quota is explicitly set

Try to broadcast quota to relevant clients proactively if quota is
explicitly set by someone, in case that client won't get quota update
for a long time.

Fixes: http://tracker.ceph.com/issues/24133
Signed-off-by: Zhi Zhang <zhangz.david@outlook.com>
(cherry picked from commit b2a7643b102dbbb8221dcb8a785db5e4276ac284)

qa/tests: added missed ubuntu_latest

Signed-off-by: Yuri Weinstein <yweinste@redhat.com>

doc: Fix typo in ceph-fuse

Fixes: https://github.com/ceph/ceph/pull/21616#pullrequestreview-122923127
Signed-off-by: Jos Collin <jcollin@redhat.com>
(cherry picked from commit 7fd3189c98b0b1c2885110c2c33487ef36a9596a)

Merge pull request #21603 from joscollin/wip-23151-luminous

luminous: doc: Update ceph-fuse doc

Reviewed-by: Sage Weil <sage@redhat.com>

client: fix issue of revoking non-auth caps

when non-auth mds revokes caps, Fcb caps can still be issued by auth
auth mds. It's wrong to flush buffer or invalidate cache when non-auth
mds revokes other caps. This bug can cause client to not respond the
revoke.

Signed-off-by: "Yan, Zheng" <zyan@redhat.com>
Fixes: https://tracker.ceph.com/issues/24172
(cherry picked from commit 341a9114e0726e1a7cbb7e6f22adb54c2024c506)

Merge pull request #22076 from tchaikov/wip-cmake-build-rocksdb-no-Werror

luminous: cmake: disable FAIL_ON_WARNINGS for rocksdb

Reviewed-by: Nathan Cutler <cutler@suse.cz>
Reviewed-by: Patrick Donnelly <pdonnell@redhat.com>

Merge pull request #22197 from dzafman/wip-test-fixes-luminous

luminous: test fixes

Reviewed-by: Kefu Chai <kchai@redhat.com>

qa/tasks/cephfs: add timeout parameter to kclient umount_wait

Just make caller happy. there is no easy way to support timeout.

Signed-off-by: Yan, Zheng <zyan@redhat.com>
Fixes: https://tracker.ceph.com/issues/24053
(cherry picked from commit e7d0b41deae7ec99ddf0a1f5f30ea82683b7b474)

mds: reply session reject for open request from blacklisted client

Kernel client and old version libcephfs do not check if themselves
are blacklisted. They can be stuck at opening session after getting
blacklisted. The session reject message can avoid this.

Signed-off-by: "Yan, Zheng" <zyan@redhat.com>
Fixes: https://tracker.ceph.com/issues/24054
(cherry picked from commit b7c6cd8a54f094acb58603b8c6bae9e570a73e27)

test: wait_for_pg_stats() should do another check after last 13 second sleep

Signed-off-by: David Zafman <dzafman@redhat.com>
(cherry picked from commit 151de1797b9163918b95a5996f422688e0964126)

os/bluestore: fix data read error injection in bluestore

Signed-off-by: Sage Weil <sage@redhat.com>
(cherry picked from commit be32d15a04d9d900f604aa366e82791249f1bdb2)

ceph-volume tests.functional install new ceph-ansible dependencies

Make note that ceph-ansible's requirements.txt can't be used just yet

Signed-off-by: Alfredo Deza <adeza@redhat.com>
(cherry picked from commit 22310f43165e474e8e12732be57217b26e2b5424)

mds: set could_consume to false when no purge queue item actually executed

Fixes: http://tracker.ceph.com/issues/24073
Signed-off-by: Xuehan Xu <xuxuehan@360.cn>
(cherry picked from commit 46b4e6afa631058fe066bfd58c76d644d5c2181d)

Merge pull request #21502 from smithfarm/wip-23782-luminous

luminous: table of contents doesn't render for luminous/jewel docs

Reviewed-by: Alfredo Deza <adeza@redhat.com>
Reviewed-by: Casey Bodley <cbodley@redhat.com>

mds: tighten conditions of calling rejoin_gather_finish()

Handle two cases:
1. mds receives all cache rejoin messages, then receives mdsmap that
   says mds cluster enters rejoining state.
2. when opening undef inodes/dirfrags, other mds restarts.

Signed-off-by: "Yan, Zheng" <zyan@redhat.com>
(cherry picked from commit 0a38a499b86c0ee13aa0e783a8359bcce0876088)

mds: avoid calling rejoin_gather_finish() two times successively

If MDCache::rejoin_gather is empty and MDCache::rejoins_pending is true
when MDCache::process_imported_caps() calls maybe_send_pending_rejoins()
Both MDCache::rejoin_send_rejoins() and MDCache::process_imported_caps()
may call rejoin_gather_finish().

Signed-off-by: "Yan, Zheng" <zyan@redhat.com>
Fixes: http://tracker.ceph.com/issues/24047
(cherry picked from commit 0451dae777a2a9b1e70303d7bbc4398849f45f3e)

mds: properly reconnect client caps after loading inodes

Commit e43c02d6 "mds: filter out blacklisted clients when importing
caps" makes MDCache::process_imported_caps() ignore clients that are
not in MDCache::rejoin_imported_session_map. The map does not contain
clients from which mds has received reconnect messages. This causes
some client caps (corresponding inodes were not in cache when mds was
in reconnect state) to get dropped.

Signed-off-by: "Yan, Zheng" <zyan@redhat.com>
(cherry picked from commit 48f60e7f274de9d76499816a528eff859bb161e3)

Conflicts:
src/mds/MDCache.h: Resolved for rejoin_recovered_client and
rejoin_open_sessions_finish

mds: filter out blacklisted clients when importing caps

The very first step of importing caps is calling
Server::prepare_force_open_sessions(). This patch makes the function
ignore blacklisted clients and return a session map for clients that
are not blacklisted. This patch also modify the codes that actually
do cap imports, make them skip caps for clients that are not in the
session map.

Signed-off-by: "Yan, Zheng" <zyan@redhat.com>
Fixes: http://tracker.ceph.com/issues/23518
(cherry picked from commit e43c02d6abd065dff413440a0f9c3d3f6653e87b)

Conflicts:
src/mds/MDCache.h: Resolved in rejoin_open_sessions_finish
src/mds/Migrator.cc : Resolved in handle_export_dir
and decode_import_inode_caps
src/mds/Server.cc : Resolved in _rename_prepare_import

mds: don't add blacklisted clients to reconnect gather set

Signed-off-by: "Yan, Zheng" <zyan@redhat.com>
(cherry picked from commit 857e3edac5eec82f1d04caec440d3d6e61bbf679)

Conflicts:
src/mds/SessionMap.h: Removed get_client_set

mds: combine MDCache::{cap_exports,cap_export_targets}

this change saves a map lookup

Signed-off-by: "Yan, Zheng" <zyan@redhat.com>
(cherry picked from commit ea72863b2b8ab5c387b70687300f6f7cff2019db)

client: avoid freeing inode when it contains TX buffer heads

ObjectCacher::discard_set() prematurely delete TX buffer heads. But
the pending writebacks still pin parent objects of these buffer heads.
Assertion "oset.objects.empty()" gets triggered if inode with pending
writebacks get freed.

Fixes:http://tracker.ceph.com/issues/23837
Signed-off-by: Guan yunfei <yunfei.guan@xtaotech.com>
Signed-off-by: "Yan, Zheng" <zyan@redhat.com>
(cherry picked from commit 8a03757ca0ab493c6c2ea4fa4307e053e8ebc944)

osdc/ObjectCacher: allow discard to complete in-flight writeback

Signed-off-by: Jason Dillaman <dillaman@redhat.com>
(cherry picked from commit feee52d57d6386a2d62580d1b7ca24ee56831b20)

test: Whitelist corrections

Signed-off-by: David Zafman <dzafman@redhat.com>
(cherry picked from commit ee4acb6e1ff7458ceaefdb288cbcb158c6a3bed3)

Add "erasure code profile property .ruleset-failure-domain. is no longer supported" for luminous

Merge pull request #22134 from dzafman/wip-missed-backport

test: Add CACHE_POOL_NO_HIT_SET to whitelist for mon/pool_ops.sh

Reviewed-by: Josh Durgin <jdurgin@redhat.com>

test: Add CACHE_POOL_NO_HIT_SET to whitelist for mon/pool_ops.sh

Ignore
  cluster [WRN] Health check failed: 1 cache pools are missing hit_sets (CACHE_POOL_NO_HIT_SET)

Signed-off-by: David Zafman <dzafman@redhat.com>
(cherry picked from commit 4fad800043d44024a496f78869e9bb02a16af063)

Merge pull request #22044 from dzafman/wip-24045-luminous

luminous: osd: Don't evict even when preemption has restarted with smaller chunk

Reviewed-by: Josh Durgin <jdurgin@redhat.com>

Merge pull request #22131 from ceph/wip-yuriw-clients-fix-luminous

qa/tests: added supported distro

Reviewed-by: Josh Durgin <jdurgin@redhat.com>

Merge pull request #22128 from liewegas/wip-rbd-msgr-luminous

luminous: qa/suites/rbd/basic/msgr-failures: remove many.yaml

Reviewed-by: Jason Dillaman <dillaman@redhat.com>

qa/suites/rbd/basic/msgr-failures: remove many.yaml

Overkill, and triggers some failures, see
http://tracker.ceph.com/issues/23789

Removed in master by 4046f46d0e6a70d860d74945dfb95c2511394640

Fixes: http://tracker.ceph.com/issues/23789
Signed-off-by: Sage Weil <sage@redhat.com>

Merge pull request #21547 from VictorDenisov/backport

luminous: tests: filestore journal replay does not guard omap operations

Reviewed-by: David Zafman <dzafman@redhat.com>

Merge pull request #21515 from tchaikov/wip-luminous-pr-21469

luminous: mon/LogMonitor: do not crash on log sub w/ no messages

Reviewed-by: David Zafman <dzafman@redhat.com>

Merge pull request #21376 from pdvian/wip-23666-luminous

luminous: msg/async/AsyncConnection: Fix FPE in process_connection

Reviewed-by: Kefu Chai <kchai@redhat.com>

Merge pull request #21405 from pdvian/wip-23672-luminous

luminous: os/bluestore: alter the allow_eio policy regarding kernel's error list.

Reviewed-by: Kefu Chai <kchai@redhat.com>
Reviewed-by: Sage Weil <sage@redhat.com>

Merge pull request #21407 from tchaikov/wip-luminous-23246

luminous: os/bluestore: fix exceeding the max IO queue depth in KernelDevice.

Reviewed-by: Radoslaw Zarzynski <rzarzyns@redhat.com>

Merge pull request #21514 from smithfarm/wip-posix-zfs-luminous

luminous: common: posix_fallocate on ZFS returns EINVAL

Reviewed-by: Mykola Golub <mgolub@mirantis.com>
Reviewed-by: Willem Jan Withagen <wjw@digiware.nl>

Merge pull request #21818 from xiexingguo/wip-23925

luminous: osd/OSDMap: check against cluster topology changing before applying pg upmaps

Reviewed-by: Sage Weil <sage@redhat.com>

mds: include nfiles/nsubdirs of directory inode in MClientCaps

Directory inode's dirstat gets updated by request reply, but not by
cap message. This causes problem for following case.

1. MDS modifies a directory
2. MDS issues CEPH_CAP_ANY_SHARED to client
3. The client satifies stat(2) by its cached metadata.

Signed-off-by: "Yan, Zheng" <zyan@redhat.com>
Fixes: http://tracker.ceph.com/issues/23855
(cherry picked from commit ee2c628f6783954e9b25fab8ac9b572a58666a91)

Conflicts:
src/messages/MClientCaps.h: Resolved in encode_payload

qa/tasks/cephfs: add test for renewing stale session

Signed-off-by: "Yan, Zheng" <zyan@redhat.com>
(cherry picked from commit 5688476513a78cf9ab2cf3b1f65e6244f05ea73d)

Conflicts:
qa/tasks/cephfs/test_client_recovery.py: Added test test_stale_renew

client: invalidate caps and leases when session becomes stale

Signed-off-by: "Yan, Zheng" <zyan@redhat.com>
Fixes: https://tracker.ceph.com/issues/23894
(cherry picked from commit 8b2e7d834ccf2a4ff6c7aa3d4aeee07ebe36fb59)

Conflicts:
src/client/Client.cc : Resolved in add_update_cap

client: fix race in concurrent readdir

For a large directory, program needs to issue multiple readdir
syscalls to get all dentries. When there are multiple programs
read the directory concurrently. Following sequence of events
can happen.

 - program calls readdir with pos = 2. ceph sends readdir request
   to mds. The reply contains N1 entries. ceph adds these N1 entries
   to readdir cache.
 - program calls readdir with pos = N1+2. The readdir is satisfied
   by the readdir cache, N2 entries are returned. (Other program
   calls readdir in the middle, which fills the cache)
 - program calls readdir with pos = N1+N2+2. ceph sends readdir
   request to mds. The reply contains N3 entries and it reaches
   directory end. ceph adds these N3 entries to the readdir cache
   and marks directory complete.

The second readdir call does not update dirp->cache_index. ceph adds
the last N3 entries to wrong places.

Signed-off-by: "Yan, Zheng" <zyan@redhat.com>
Fixes: http://tracker.ceph.com/issues/23894
(cherry picked from commit 01e23c178d068a3983c58cf115d57f6e1cc06255)

qa/tests: added supported distro

Signed-off-by: Yuri Weinstein <yweinste@redhat.com>

Merge pull request #21575 from ceph/wip-cd-fix-pool-create

luminous: tests: ceph-deploy: create the rbd pool right after install

test: Fix omap_digest changes in osd-scrub-repair.sh

Signed-off-by: David Zafman <dzafman@redhat.com>

test: No more omap_digest being set

Signed-off-by: David Zafman <dzafman@redhat.com>