ceph/doc/changelog/v0.80.2.txt

commit 198236d68deceb16b6b590d807786a140209bfea (tag: refs/tags/v0.80.2, refs/remotes/gh/last)
Author: Jenkins <jenkins@inktank.com>
Date:   Wed Jul 9 19:32:26 2014 +0000

    0.80.2

commit 0b6bd2545925b5e8a80d41de1fda13ffe9d30e2b
Author: Josh Durgin <josh.durgin@inktank.com>
Date:   Wed Jul 9 12:04:49 2014 -0700

    Revert "rgw: if extra data pool name is empty, use data pool name instead"
    
    This breaks multipart uploads on firefly, though not on master.
    Revert for now so we can release 0.80.2.
    
    This reverts commit 5fd8b0d1639c67e355f0fc0d7e6d7036618d87a1.

commit 9426c4faa9ca327f18f20a57ba772b08d6f069e7
Merge: b81a277 4733178
Author: Sage Weil <sage@inktank.com>
Date:   Tue Jul 8 10:06:01 2014 -0700

    Merge pull request #2083 from ceph/wip-8727.firefly
    
    messages: MForward: fix compat version
    
    Reviewed-by: Sage Weil <sage@redhat.com>

commit 4733178c3a8f57c54196f176b20154415783dba0
Author: Joao Eduardo Luis <joao.luis@inktank.com>
Date:   Tue Jul 8 16:46:27 2014 +0100

    messages: MForward: fix compat version
    
    A while ago we bumped the head version and reset the compat version to 0.
    Doing this so happens to make the messenger assume that the message does
    not support the compat versioning and sets the compat version to the head
    version -- thus making compat = 2 when it should have been 1.
    
    The nasty side-effect of this is that upgrading from emperor to firefly
    will have emperor-leaders being unable to decode forwarded messages from
    firefly-peons.
    
    Fixes: #8727
    
    Signed-off-by: Joao Eduardo Luis <joao.luis@inktank.com>
    (cherry picked from commit c92feebb81f90344a085f8256f0ed03cdc2f14e1)

commit b81a2777aea636ffe544e737cd8e17dc892ba328
Author: Dan Mick <dan.mick@inktank.com>
Date:   Thu Jul 3 16:11:24 2014 -0700

    ceph.spec.in: add bash completion file for radosgw-admin
    
    Signed-off-by: Sandon Van Ness <sandon@inktank.com>
    (cherry picked from commit b70096307130bcbac176704493a63c5d039d3edc)

commit 4649d7e90ffec89b452aef69cf833522bdb81f88
Author: Dan Mick <dan.mick@inktank.com>
Date:   Thu Jul 3 16:10:55 2014 -0700

    ceph.spec.in: rhel7-related changes:
    
    udev rules: /lib -> /usr/lib
    /sbin binaries move to /usr/sbin or %{_sbindir}
    
    Signed-off-by: Sandon Van Ness <sandon@inktank.com>
    (cherry picked from commit 235e4c7de8f8efe491edefbdde8e5da4dfc44034)
    
    Conflicts:
    	ceph.spec.in

commit 38a9566e70d3a2de80c7547fd4e84c8372639f80
Author: Dan Mick <dan.mick@inktank.com>
Date:   Thu Jul 3 16:08:44 2014 -0700

    Fix/add missing dependencies:
    
    - rbd-fuse depends on librados2/librbd1
    - ceph-devel depends on specific releases of libs and libcephfs_jni1
    - librbd1 depends on librados2
    - python-ceph does not depend on libcephfs1
    
    Signed-off-by: Sandon Van Ness <sandon@inktank.com>
    (cherry picked from commit 7cf81322391b629b241da90181800ca1f138ce78)
    
    Conflicts:
    	ceph.spec.in

commit 733c89dc6af89321ee58ad78b30bc6a0c4e78291
Author: Dan Mick <dan.mick@inktank.com>
Date:   Thu Jul 3 16:05:00 2014 -0700

    ceph.spec.in: whitespace fixes
    
    Signed-off-by: Sandon Van Ness <sandon@inktank.com>
    (cherry picked from commit ec8af52a5ede78511423a1455a496d46d580c644)
    
    Conflicts:
    	ceph.spec.in

commit 21b03bc96ab1a0877235f1e3e4a96899cba2b4fa
Author: Dan Mick <dan.mick@inktank.com>
Date:   Thu Jul 3 16:04:10 2014 -0700

    ceph.spec.in: split out ceph-common as in Debian
    
    Move files, postun scriptlet, and add dependencies on ceph-common
    where appropriate
    
    Signed-off-by: Sandon Van Ness <sandon@inktank.com>
    (cherry picked from commit e131b9d5a5e90e87d8a8346cb96cb5a26135c144)

commit dbee797d1344aec47fedc8d3fdd6c9460e0ffa16
Merge: 6d6039a 9e81fc1
Author: Sage Weil <sage@inktank.com>
Date:   Mon Jul 7 09:40:51 2014 -0700

    Merge pull request #2057 from ceph/wip-8593-firefly
    
    mon: backport health check improvements
    
    Reviewed-by: Joao Eduardo Luis <joao.luis@inktank.com>

commit 6d6039a5a56743c006a0d081157cb6ee9e3b7af6
Author: Greg Farnum <greg@inktank.com>
Date:   Thu Jul 3 16:30:49 2014 -0700

    mon: check changes to the whole CRUSH map and to tunables against cluster features
    
    When we change the tunables, or set a new CRUSH map, we need to make sure it's
    supported by all the monitors and OSDs currently participating in the cluster.
    
    Fixes: #8738
    
    Signed-off-by: Greg Farnum <greg@inktank.com>
    (cherry picked from commit 54af8104816ccc76aad251aa47a6efc1bf879e7d)

commit 0a8d194f2c44a73c31ae8c52fabb430d66d4a1b1
Author: Greg Farnum <greg@inktank.com>
Date:   Thu Jul 3 15:24:30 2014 -0700

    OSDMonitor: fix quorum_features comparison in check_cluster_features
    
    We need to see if there's a feature which is not in the quorum_features,
    not if there are no features in common!
    
    Signed-off-by: Greg Farnum <greg@inktank.com>
    (cherry picked from commit 2280c0eaa9f3f733062085a5e7f7dc23c3bbe291)

commit a49c61222f8014db533d8f505ec44d10dc5478e6
Author: Sage Weil <sage@inktank.com>
Date:   Mon Jun 16 12:57:36 2014 -0700

    ceph_test_rados_api_tier: disable LibRadosTierECPP::HitSetWrite
    
    Disable this test until hitget-get reliably works on EC pools (currently
    it does not, and this test usually passes only because we get the in-memory
    HitSet).
    
    Signed-off-by: Sage Weil <sage@inktank.com>
    (cherry picked from commit c5b5ed672c039cc4fa04772e065a59d3b1df803a)

commit 828ce4055c8580e42175159c02a9dfa76bc414ff
Merge: b9b498e b1a4a7c
Author: Sage Weil <sage@inktank.com>
Date:   Fri Jul 4 21:18:32 2014 -0700

    Merge pull request #2073 from ceph/wip-rgw-firefly-2
    
    rgw: more firefly backports
    
    Reviewed-by: Yehuda Sadeh <yehuda@inktank.com>

commit b1a4a7cb91e164d1f8af8ce9319e3b3c1949858d
Author: Yehuda Sadeh <yehuda@inktank.com>
Date:   Wed Jun 11 16:50:41 2014 -0700

    rgw: set a default data extra pool name
    
    Fixes: #8585
    Have a default name for the data extra pool, otherwise it would be empty
    which means that it'd default to the data pool name (which is a problem
    with ec backends).
    
    Signed-off-by: Yehuda Sadeh <yehuda@inktank.com>
    (cherry picked from commit b2542f8e880e45bb6d052f13eb3ef6a7c61e4cd4)

commit b9b498e6a7794205af8aa99ffe5266e478c0e711
Merge: f285266 053c261
Author: Sage Weil <sage@inktank.com>
Date:   Thu Jul 3 07:00:52 2014 -0700

    Merge pull request #2028 from ceph/wip-rgw-firefly
    
    rgw: a couple backports for firefly
    
    Passed the rgw suite, modulo a python bootstrap issue.
    
    sage-2014-07-01_09:50:22-rgw-wip-rgw-firefly-testing-basic-plana/337393
    
    Reviewed-by: Yehuda Sadeh <yehuda@inktank.com>

commit 9f06e2c16e409a9a8284af9964f0cfff6e222164
Author: Sage Weil <sage@inktank.com>
Date:   Mon Jun 30 12:55:45 2014 -0700

    rgw: fix uninit ofs in RGWObjManifect::obj_iterator
    
    Valgrind picked this up:
    
      <kind>UninitCondition</kind>
      <what>Conditional jump or move depends on uninitialised value(s)</what>
      <stack>
        <frame>
          <ip>0x5145B8</ip>
          <obj>/usr/bin/radosgw</obj>
          <fn>RGWObjManifest::obj_iterator::seek(unsigned long)</fn>
          <dir>/srv/autobuild-ceph/gitbuilder.git/build/out~/ceph-0.82-354-g62027ec/src/rgw</dir>
          <file>rgw_rados.cc</file>
          <line>562</line>
        </frame>
        <frame>
          <ip>0x5672A4</ip>
          <obj>/usr/bin/radosgw</obj>
          <fn>list_multipart_parts(RGWRados*, req_state*, std::string const&amp;, std::string&amp;, int, int, std::map&lt;unsigned int, RGWUploadPartInfo, std::less&lt;unsigned int&gt;, std::allocator&lt;std::pair&lt;unsigned int const, RGWUploadPartInfo&gt; &gt; &gt;&amp;, int*, bool*, bool)</fn>
          <dir>/srv/autobuild-ceph/gitbuilder.git/build/out~/ceph-0.82-354-g62027ec/src/rgw</dir>
          <file>rgw_rados.h</file>
          <line>217</line>
        </frame>
        <frame>
          <ip>0x5688EE</ip>
          <obj>/usr/bin/radosgw</obj>
          <fn>RGWListMultipart::execute()</fn>
          <dir>/srv/autobuild-ceph/gitbuilder.git/build/out~/ceph-0.82-354-g62027ec/src/rgw</dir>
          <file>rgw_op.cc</file>
          <line>2956</line>
        </frame>
    ...
    
    Fixes: #8699
    Backport: firefly
    Signed-off-by: Sage Weil <sage@inktank.com>
    (cherry picked from commit e0d3b78b6af523ae77b0cee385cd40f67f7a0ab6)

commit 5fd8b0d1639c67e355f0fc0d7e6d7036618d87a1
Author: Yehuda Sadeh <yehuda@inktank.com>
Date:   Fri May 30 14:47:25 2014 -0700

    rgw: if extra data pool name is empty, use data pool name instead
    
    Fixes: #8311
    An empty pool name could be used as the extra data pool.
    
    Signed-off-by: Yehuda Sadeh <yehuda@inktank.com>
    (cherry picked from commit b300318113b162522759d4794b1cfa3d1d9398e4)

commit cbad09e1907ceac4feb069f9cf257e580f36da91
Author: Yehuda Sadeh <yehuda@inktank.com>
Date:   Tue May 6 15:35:20 2014 -0700

    rgw: extend manifest to avoid old style manifest
    
    In case we hit issue #8269 we'd like to avoid creating an old style
    manifest. Since we need to have parts that use different prefix we add a
    new rule param that overrides the manifest prefix.
    
    Signed-off-by: Yehuda Sadeh <yehuda@inktank.com>
    (cherry picked from commit 545d8ad1d2dfe53b967ab1bd17dfeb1780abbb5e)

commit ea68b9372319fd0bab40856db26528d36359102e
Author: Yehuda Sadeh <yehuda@inktank.com>
Date:   Fri May 2 17:06:05 2014 -0700

    rgw: don't allow multiple writers to same multiobject part
    
    Fixes: #8269
    Backport: firefly, dumpling
    
    A client might need to retry a multipart part write. The original thread
    might race with the new one, trying to clean up after it, clobbering the
    part's data.
    The fix is to detect whether an original part already existed, and if so
    use a different part name for it.
    
    Signed-off-by: Yehuda Sadeh <yehuda@inktank.com>
    (cherry picked from commit bd8e026f88b812cc70caf6232c247844df5d99bf)

commit f285266a320bf22df8b09a669d1c1fd400b05765
Merge: d43e711 6a0dd1b
Author: Sage Weil <sage@inktank.com>
Date:   Tue Jul 1 16:16:09 2014 -0700

    Merge pull request #2056 from ceph/wip-8010
    
    Revert "mon: OSDMonitor: Refuse to delete CephFS pools"
    
    Reviewed-by: Sage Weil <sage@redhat.com>

commit 9e81fc180a3999ebec95949a2cb31fea970573fb
Author: Sage Weil <sage@inktank.com>
Date:   Mon Jun 16 17:00:51 2014 -0700

    mon: ensure HealthService warning(s) include a summary
    
    The low disk space check would change our status to HEALTH_WARN and include
    a detail message, but no summary.  We need both.
    
    Backport: firefly
    Signed-off-by: Sage Weil <sage@inktank.com>
    (cherry picked from commit 3ed7f2dd4345633ff34017b201082f4c261ef387)

commit e96637c2e33ec092f28af0ce96bfe2e4d7748ff8
Author: Sage Weil <sage@inktank.com>
Date:   Mon Jun 16 16:58:14 2014 -0700

    mon: refactor check_health()
    
    Refactor the get_health() methods to always take both a summary and detail.
    Eliminate the return value and pull that directly from the summary, as we
    already do with the PaxosServices.
    
    Signed-off-by: Sage Weil <sage@inktank.com>
    (cherry picked from commit 82e47db8073b622183a5e33f6e0b999a3a144804)

commit 28584200df36dda5d434d4d7f58585933905de30
Author: Sage Weil <sage@inktank.com>
Date:   Mon Jun 16 16:40:05 2014 -0700

    mon: fix typos, punctuation for mon disk space warning(s)
    
    Backport: firefly
    Signed-off-by: Sage Weil <sage@inktank.com>
    (cherry picked from commit 98883f6308ce72f69a71feab29ef00e13f319cdb)
    
    Conflicts:
    
    	src/mon/DataHealthService.cc

commit 4f0666085e2fd553ccc05cef8510aae820849aca
Author: Sage Weil <sage@inktank.com>
Date:   Mon Jun 16 16:27:05 2014 -0700

    mon/OSDMonitor: make down osd count sensible
    
    We currently log something like
    
     1/10 in osds are down
    
    in the health warning when there are down OSDs, but this is based on a
    comparison of the number of up vs the number of in osds, and makes no sense
    when there are up osds that are not in.
    
    Instead, count only the number OSDs that are both down and in (relative to
    the total number of OSDs in) and warn about that.  This means that, if a
    disk fails, and we mark it out, and the cluster fully repairs itself, it
    will go back to a HEALTH_OK state.
    
    I think that is a good thing, and certainly preferable to the current
    nonsense.  If we want to distinguish between down+out OSDs that were failed
    vs those that have been "acknowledged" by an admin to be dead, we will
    need to add some additional state (possibly reusing the AUTOOUT flag?), but
    that will require more discussion.
    
    Backport: firefly (maybe)
    Signed-off-by: Sage Weil <sage@inktank.com>
    (cherry picked from commit 55a97787088b79356c678a909b2410b3924e7f5b)

commit 6a0dd1be909b423f52e2c7f11531b278dc8838ae
Author: John Spray <john.spray@redhat.com>
Date:   Tue Jul 1 22:04:25 2014 +0100

    Revert "mon: OSDMonitor: Refuse to delete CephFS pools"
    
    This reverts commit c7d265a9b276aad5caf9b35f3ce8bc7bdd169f0f.
    
    Because this pre-dates the `fs rm` command, this change was
    preventing firefly users from ever deleting their filesystem pools.
    
    Fixes: #8010
    
    Signed-off-by: John Spray <john.spray@redhat.com>

commit 053c261e5bfcb4d39770048775515eb6a667f987
Author: Yehuda Sadeh <yehuda@inktank.com>
Date:   Wed Jun 4 09:24:33 2014 -0700

    rgw: set meta object in extra flag when initializing it
    
    As part of the fix for 8452 we moved the meta object initialization.
    Missed moving the extra flag initialization that is needed. This breaks
    setups where there's a separate extra pool (needed in ec backends).
    
    Reported-by: Sylvain Munaut <s.munaut@whatever-company.com>
    Signed-off-by: Yehuda Sadeh <yehuda@inktank.com>
    (cherry picked from commit 703d0eb9bffdf6c553b659728a3a07f068fb15ee)

commit d43e7113dd501aea1db33fdae30d56e96e9c3897
Author: Sage Weil <sage@inktank.com>
Date:   Mon Jun 30 07:05:04 2014 -0700

    qa/workunits/suites/fsx.sh: don't use zero range
    
    Zero range is not supported by cephfs.
    
    Fixes: #8542
    Signed-off-by: Sage Weil <sage@inktank.com>
    (cherry picked from commit 2dec8a810060f65d022c06e82090b4aa5ccec0cb)

commit ee0d322c0b1ebaba2f225b8bed9af2948fdcf4c3
Merge: 3ceafcf a7119c3
Author: Loic Dachary <loic@dachary.org>
Date:   Mon Jun 30 17:01:03 2014 +0200

    Merge pull request #1991 from dachary/wip-8307-erasure-code-profile-implicit-creation
    
    erasure code profile implicit creation (firefly backport)
    
    Reviewed-by: Joao Eduardo Luis <joao.luis@inktank.com>

commit a7119c31e9a1b415f56426d2b4cd362357ad8b17
Author: Loic Dachary <loic@dachary.org>
Date:   Wed Jun 11 22:44:57 2014 +0200

    erasure-code: pool create must not create profiles
    
    If a non existent profile is provided as an argument to osd pool create,
    it must exit on error and not create the profile as a side effect.
    
    http://tracker.ceph.com/issues/8307 refs: #8307
    
    Signed-off-by: Loic Dachary <loic@dachary.org>
    (cherry picked from commit ff2eb234e63cd281b40405cb3397da5babda943f)

commit a67c1c1c51b111f40819643530e07f8026227caa
Author: Loic Dachary <loic@dachary.org>
Date:   Wed Jun 11 22:47:49 2014 +0200

    erasure-code: OSDMonitor::get_erasure_code is a const
    
    If it is not, the non const version of OSDMap::get_erasure_code_profile
    is called and a profile is created as a side effect, which is not
    intended.
    
    http://tracker.ceph.com/issues/8307 refs: #8307
    
    Signed-off-by: Loic Dachary <loic@dachary.org>
    (cherry picked from commit 3c638111a4943758b6089c63a42aabbf281ac257)

commit 3ceafcf3576efaef58dffbe70654baf1db4f3a1d
Author: Loic Dachary <loic@dachary.org>
Date:   Tue May 27 10:06:46 2014 +0200

    mon: fix set cache_target_full_ratio
    
    It was a noop because it was incorrectly using the variable n. Add a
    test to protect against regression.
    
    http://tracker.ceph.com/issues/8440 Fixes: #8440
    
    Reported-by: Geoffrey Hartz <hartz.geoffrey@gmail.com>
    Signed-off-by: Loic Dachary <loic@dachary.org>
    (cherry picked from commit c2225f874dcf37222d831b65b5a319d598d2fcd9)

commit 5f66a2c99fdef2c8d609126740ca790ce10e67a4
Author: Yehuda Sadeh <yehuda@inktank.com>
Date:   Mon Jun 16 11:48:24 2014 -0700

    rgw: allocate enough space for bucket instance id
    
    Fixes: #8608
    Backport: dumpling, firefly
    Bucket instance id is a concatenation of zone name, rados instance id,
    and a running counter. We need to allocate enough space to account zone
    name length.
    
    Signed-off-by: Yehuda Sadeh <yehuda@inktank.com>
    (cherry picked from commit d2e86a66ca55685e04ffbfaa58452af59f381277)

commit 84d7971c8e50e7d35d7a5fac9353e687f168a1a1
Author: Alfredo Deza <alfredo.deza@inktank.com>
Date:   Fri Jun 20 11:14:25 2014 -0400

    log the command that is being run with subprocess
    
    Signed-off-by: Alfredo Deza <alfredo.deza@inktank.com>
    (cherry picked from commit e189a668285f9ab73116bc19f9df1cc515473541)

commit 291d448478360a1be0a9826ada58c94ecd643ad0
Author: Yehuda Sadeh <yehuda@inktank.com>
Date:   Fri May 30 16:17:47 2014 -0700

    rgw: fetch object attrs on multipart completion
    
    Fixes: #8452
    Backport: firefly
    This fixes a regression following a code cleanup.
    
    Signed-off-by: Yehuda Sadeh <yehuda@inktank.com>
    (cherry picked from commit 70afaaabf979d4cc1a14dbc2b772224cbafcac2f)

commit 2fd808fe93fe0cbd8754eb81d281c83254411039
Author: Yehuda Sadeh <yehuda@inktank.com>
Date:   Thu May 22 18:27:58 2014 -0700

    rgw: check appropriate entity permission on put_metadata
    
    Fixes: #8428
    Backport: firefly
    
    Cannot use verify_object_permission() to test acls, as the operation
    here might either be on object or on bucket.
    
    Signed-off-by: Yehuda Sadeh <yehuda@inktank.com>
    (cherry picked from commit 2ceb13af34bc38b418bb88d81131d770a71159bf)

commit d1afeb38b522baae1b15a7a3548002c830bb7567
Author: Ilya Dryomov <ilya.dryomov@inktank.com>
Date:   Thu Jun 5 10:08:42 2014 +0400

    XfsFileStoreBackend: call ioctl(XFS_IOC_FSSETXATTR) less often
    
    No need to call ioctl(XFS_IOC_FSSETXATTR) if extsize is already set to
    the value we want or if any extents are allocated - XFS will refuse to
    change extsize in that's the case.
    
    Fixes: #8241
    Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
    (cherry picked from commit bc3b30ed09b8f3eb86b61e3a05ccacfd928faa95)

commit 7b8e5c99a4a40ae788ad29e36b0d714f529b12eb
Author: John Spray <john.spray@inktank.com>
Date:   Tue May 20 16:25:19 2014 +0100

    mon: Fix default replicated pool ruleset choice
    
    Specifically, in the case where the configured
    default ruleset is CEPH_DEFAULT_CRUSH_REPLICATED_RULESET,
    instead of assuming ruleset 0 exists, choose the lowest
    numbered ruleset.
    
    In the case where an explicit ruleset is passed to
    OSDMonitor::prepare_pool_crush_ruleset, verify
    that it really exists.
    
    The idea is to eliminate cases where a pool could
    exist with its crush ruleset set to something
    other than a value ruleset ID.
    
    Fixes: #8373
    
    Signed-off-by: John Spray <john.spray@inktank.com>
    (cherry picked from commit 1d9e4ac2e2bedfd40ee2d91a4a6098150af9b5df)
    
    Conflicts:
    
    	src/crush/CrushWrapper.h

commit 25a4a874c8e53cd644d6705478fbea4fdb232c4d
Author: Yehuda Sadeh <yehuda@inktank.com>
Date:   Fri May 23 14:58:54 2014 -0700

    rgw: calc md5 and compare if user provided appropriate header
    
    Fixes: #8436
    Backport: firefly
    
    This was broken in ddc2e1a8e39a5c6b9b224c3eebd1c0e762ca5782. The fix
    resurrects and old check that was dropped.
    
    Signed-off-by: Yehuda Sadeh <yehuda@inktank.com>
    Reviewed-by: Sage Weil <sage@inktank.com>
    (cherry picked from commit 9c56c86bdac6bcb8e76c3f04e7d393e4eaadd721)

commit ad18a45a71be34899d9400c8bdef39d0548f9aaf
Author: Yehuda Sadeh <yehuda@inktank.com>
Date:   Mon Apr 21 15:07:12 2014 -0700

    rgw: calculate user manifest
    
    Fixes: #8169
    Backport: firefly
    We didn't calculate the user manifest's object etag at all. The etag
    needs to be the md5 of the contantenation of all the parts' etags.
    
    Signed-off-by: Yehuda Sadeh <yehuda@inktank.com>
    (cherry picked from commit ddc2e1a8e39a5c6b9b224c3eebd1c0e762ca5782)

commit 6aa7f7ee4e082819decc48da1f0eaffc4e616302
Author: Sage Weil <sage@inktank.com>
Date:   Tue Jun 3 11:45:20 2014 -0700

    librados: simplify/fix rados_pool_list bounds checks
    
    We were not breaking out of the loop when we filled up the buffer unless
    we happened to do so on a pool name boundary.  This means that len would
    roll over (it was unsigned).  In my case, I was not able to reproduce
    anything particularly bad since (I think) the strncpy was interpreting the
    large unsigned value as signed, but in any case this fixes it, simplifies
    the arithmetic, and adds a simple test.
    
    - use a single 'rl' value for the amount of buffer space we want to
      consume
    - use this to check that there is room and also as the strncat length
    - rely on the initial memset to ensure that the trailing 0 is in place.
    
    Fixes: #8447
    Signed-off-by: Sage Weil <sage@inktank.com>
    (cherry picked from commit 3ec32a6bb11d92e36a0e6381b40ce2fd1fbb016a)

commit 2ba03e08f1bce0a8af87014583d635eb5c0aa376
Merge: 50dc246 3ad451e
Author: Sage Weil <sage@inktank.com>
Date:   Wed Jun 25 12:42:11 2014 -0700

    Merge pull request #1982 from accelazh/firefly-fix-issue-8256
    
    Make <poolname> in "ceph osd tier --help" clearer (fix issue 8256).
    
    Reviewed-by: Loic Dachary <loic@dachary.org>

commit 50dc2462ab96c3457b08c50b4cc07676b50dbf72
Author: Samuel Just <sam.just@inktank.com>
Date:   Tue Jun 3 16:14:15 2014 -0700

    OSD::calc_priors_during: handle CRUSH_ITEM_NONE correctly
    
    Fixes: #8507
    Signed-off-by: Samuel Just <sam.just@inktank.com>
    (cherry picked from commit 0bd6f6797c69af9aff851033c57c42121671c684)
    
    Conflicts:
    	src/osd/OSD.cc

commit a53bcf2357c7f351ad520039774d895b8c27987f
Author: Samuel Just <sam.just@inktank.com>
Date:   Tue Jun 3 16:11:32 2014 -0700

    OSD::calc_priors_during: fix confusing for loop bracing (cosmetic)
    
    Confusing lack of braces is confusing.
    
    Signed-off-by: Samuel Just <sam.just@inktank.com>
    (cherry picked from commit d76936b92300be5cc403fd5a36616a2424c7877d)
    
    Conflicts:
    	src/osd/OSD.cc

commit 178e6f0f422c9f1b8a51d0e9c364773397a4555f
Author: Samuel Just <sam.just@inktank.com>
Date:   Tue Jun 24 10:11:21 2014 -0700

    rados.cc: fix pool alignment check
    
    Only check pool alignment if io_ctx is initialized.
    
    Introduced in 304b08a23a3db57010078046955a786fe3589ef8
    Fixes: #8652
    Signed-off-by: Samuel Just <sam.just@inktank.com>
    
    (cherry picked from commit d7350a3741bf4cdb270c6361e68090fe280cf36d)
    
    Conflicts:
    	src/tools/rados/rados.cc

commit a9f97f8cae5b9d0245e0b0842c5c581cdacbb2da
Author: Sage Weil <sage@inktank.com>
Date:   Tue Jun 17 13:33:14 2014 -0700

    osd: fix filestore perf stats update
    
    Update the struct we are about to send, not the (unlocked!) one we will
    send the next time around.
    
    Backport: firefly, dumpling
    Signed-off-by: Sage Weil <sage@inktank.com>
    (cherry picked from commit 4afffb4a10a0bbf7f2018ef3ed6b167c7921e46b)

commit b758fd5f0ebcccdb1641a852d40ee880bad01107
Author: Greg Farnum <greg@inktank.com>
Date:   Thu Apr 24 15:34:24 2014 -0700

    FileStore: set XATTR_NO_SPILL_OUT when creating new files.
    
    Fixes: #8205
    Backport: firefly
    
    Signed-off-by: Greg Farnum <greg@inktank.com>
    (cherry picked from commit e3b995e1567f3ccc6d00ae27ab2aa99ca157228a)

commit d6f302314fc3580dfc746c9d82bd2f7f0bc87d42
Author: Haomai Wang <haomaiwang@gmail.com>
Date:   Sat Jun 7 14:32:23 2014 +0800

    FileStore: make _clone() copy spill out marker
    
    Previously we were not doing so, and that resulted in unpredictable loss
    of xattrs from the client's perspective.
    
    Signed-off-by: Haomai Wang <haomaiwang@gmail.com>
    Reviewed-by: Greg Farnum <greg@inktank.com>
    (cherry picked from commit 239476a92849159d2a8966d90ca055c116bee91e)

commit bb2ed23d8129c8db628475d744656b9b43f839c0
Author: Loic Dachary <loic@dachary.org>
Date:   Wed Jun 18 17:01:54 2014 +0200

    erasure-code: verify that rados put enforces alignment
    
    http://tracker.ceph.com/issues/8622 refs: #8622
    
    Signed-off-by: Loic Dachary <loic@dachary.org>
    (cherry picked from commit b46c4056014dd6de5e3bd736f2c41f096ea708b4)

commit dece65064d949b5afcc359cd408615883b5e002a
Author: Lluis Pamies-Juarez <lluis@pamies.cat>
Date:   Wed Jun 18 10:00:09 2014 -0700

    enforce rados put aligment
    
    Signed-off-by: Lluis Pamies-Juarez <lluis.pamies-juarez@hgst.com>
    (cherry picked from commit 304b08a23a3db57010078046955a786fe3589ef8)

commit 203318b8eb3753723277ec7a459239c81097f090
Author: Sage Weil <sage@inktank.com>
Date:   Fri Jun 6 13:31:29 2014 -0700

    osd/OSDMap: do not require ERASURE_CODE feature of clients
    
    Just because an EC pool exists in the cluster does not mean tha tthe client
    has to support the feature:
    
    1) The way client IO is initiated is no different for EC pools than for
       replicated pools.
    2) People may add an EC pool to an existing cluster with old clients and
       locking those old clients out is very rude when they are not using the
       new pool.
    3) The only direct client user of EC pools right now is rgw, and the new
       versions already need to support various other features like CRUSH_V2
       in order to work.  These features are present in new kernels.
    
    Fixes: #8556
    Backport: firefly
    Signed-off-by: Sage Weil <sage@inktank.com>
    (cherry picked from commit 3fe1699f9620280d0070cfe6f01cfeb2332e7470)

commit 6340b14b9c9a9c786b5448f2ea2a5556055a02e9
Author: Sage Weil <sage@inktank.com>
Date:   Thu Jun 12 16:44:53 2014 -0700

    osd/OSDMap: make get_features() take an entity type
    
    Make the helper that returns what features are required of the OSDMap take
    an entity type argument, as the required features may vary between
    components in the cluster.
    
    Backport: firefly
    Signed-off-by: Sage Weil <sage@inktank.com>
    (cherry picked from commit 250677c965365edf3ecd24ef73700fc6d992ea42)

commit 400fa88f6cf8b1e5b4b15d9e36b1de8c3d1c3970
Author: Haomai Wang <haomaiwang@gmail.com>
Date:   Wed May 21 18:12:22 2014 +0800

    Avoid extra check for clean object
    
    We needn't to check clean object via buffer state, skip the clean object.
    
    Signed-off-by: Haomai Wang <haomaiwang@gmail.com>
    (cherry picked from commit f51e33bd9c5a8e1cfc7065b30785696dc45918bc)

commit 3ad451ef57e2ab3fc644c94d44c2de7a17cced45
Author: Accela Zhao <accelazh@gmail.com>
Date:   Wed Jun 18 17:17:03 2014 +0800

    Make <poolname> in "ceph osd tier --help" clearer.
    
    The ceph osd tier --help info on the left always says <poolname>.
    It is unclear which one to put <tierpool> on the right.
    
    $ceph osd tier --help
    osd tier add <poolname> <poolname> {--   add the tier <tierpool> to base pool
    force-nonempty}                          <pool>
    osd tier add-cache <poolname>            add a cache <tierpool> of size <size>
    <poolname> <int[0-]>                     to existing pool <pool>
    ...
    
    This patch modifies description on the right to tell which <poolname>:
    
    osd tier add <poolname> <poolname> {--   add the tier <tierpool> (the second
     force-nonempty}                          one) to base pool <pool> (the first
                                               one)
    ...
    
    Fix: http://tracker.ceph.com/issues/8256
    
    Signed-off-by: Yilong Zhao <accelazh@gmail.com>

commit f290a021bc8ec31c18b91cb37323345692f2f198
Merge: 5722419 d02d46e
Author: Sage Weil <sage@inktank.com>
Date:   Mon Jun 16 09:25:32 2014 -0700

    Merge pull request #1962 from dachary/wip-8599-ruleset-firefly
    
    mon: pool set <pool> crush_ruleset must not use rule_exists (firefly)
    
    Reviewed-by: Sage Weil <sage@inktank.com>

commit d02d46e25080d5f7bb8ddd4874d9019a078b816b
Author: John Spray <john.spray@inktank.com>
Date:   Tue May 20 16:50:18 2014 +0100

    mon: pool set <pool> crush_ruleset must not use rule_exists
    
    Implement CrushWrapper::ruleset_exists that iterates over the existing
    rulesets to find the one matching the ruleset argument.
    
    ceph osd pool set <pool> crush_ruleset must not use
    CrushWrapper::rule_exists, which checks for a *rule* existing, whereas
    the value being set is a *ruleset*. (cherry picked from commit
    fb504baed98d57dca8ec141bcc3fd021f99d82b0)
    
    A test via ceph osd pool set data crush_ruleset verifies the ruleset
    argument is accepted.
    
    http://tracker.ceph.com/issues/8599 fixes: #8599
    
    Backport: firefly, emperor, dumpling
    Signed-off-by: John Spray <john.spray@inktank.com>
    Signed-off-by: Loic Dachary <loic@dachary.org>

commit 572241942706e2f845a147f19717bf6c487f23f4
Author: Sage Weil <sage@inktank.com>
Date:   Sun Jun 8 20:18:49 2014 -0700

    init-ceph: continue after failure doing osd data mount
    
    If we are starting many daemons and hit an error, we normally note it and
    move on.  Do the same when doing the pre-mount step.
    
    Fixes: #8554
    Signed-off-by: Sage Weil <sage@inktank.com>
    (cherry picked from commit 6a7e20147cc39ed4689809ca7d674d3d408f2a17)

commit e5a291ef69316519b105b57193753f0bf8ac8e62
Author: Steve Taylor <steve@DES-U1404-STETAY.stc.local>
Date:   Tue Jun 10 12:42:55 2014 -0600

    Fix for bug #6700
    
    When preparing OSD disks with colocated journals, the intialization process
    fails when using dmcrypt. The kernel fails to re-read the partition table after
    the storage partition is created because the journal partition is already in use
    by dmcrypt. This fix unmaps the journal partition from dmcrypt and allows the
    partition table to be read.
    
    Signed-off-by: Stephen F Taylor <steveftaylor@gmail.com>
    (cherry picked from commit 673394702b725ff3f26d13b54d909208daa56d89)

commit 34d9b2bc659c4107b30e1ebe7a55315512a0222a
Author: John Wilkins <john.wilkins@inktank.com>
Date:   Thu Jun 5 11:29:20 2014 -0700

    doc: Added Disable requiretty commentary.
    
    Signed-off-by: John Wilkins <john.wilkins@inktank.com>

commit 54a89bab15a945d47b3f44448910521a2ebf41c6
Author: Samuel Just <sam.just@inktank.com>
Date:   Fri May 16 16:56:33 2014 -0700

    ReplicatedPG::start_flush: fix clone deletion case
    
    dsnapc.snaps will be non-empty most of the time if there
    have been snaps before prev_snapc.  What we really want to
    know is whether there are any snaps between oi.snaps.back()
    and prev_snapc.
    
    Fixes: 8334
    Backport: firefly
    Signed-off-by: Samuel Just <sam.just@inktank.com>
    (cherry picked from commit 29f615b7ac9e92f77cdef9927070727fee9d5e33)

commit 308e2ef5c107bf04d3c5623f3c6bdffa10cf8c21
Author: Samuel Just <sam.just@inktank.com>
Date:   Mon May 12 15:08:07 2014 -0700

    ReplicatedPG::start_flush: send delete even if there are no snaps
    
    Even if all snaps for the clone have been removed, we still have to
    send the delete to ensure that when the object is recreated the
    new snaps aren't included in the wrong clone.
    
    Signed-off-by: Samuel Just <sam.just@inktank.com>
    (cherry picked from commit 2ec2182745fa7c22526a7cf3dedb25bc314c9db4)

commit 8d04a7ece364c0a95b087990d6365401819b3efa
Author: Samuel Just <sam.just@inktank.com>
Date:   Thu May 15 20:53:27 2014 -0700

    HashIndex: in cleanup, interpret missing dir as completed merge
    
    If we stop between unlinking the empty subdir and removing the root
    merge marker, we get ENOENT on the get_info.  That's actually fine.
    
    Backport: firefly
    Fixes: 8332
    Signed-off-by: Samuel Just <sam.just@inktank.com>
    (cherry picked from commit 5ff95dbdd2dbb533d344f37fea722ca4f140e670)

commit b2bf8cb21761d88557fb2d5c0935c4a3678ee01f
Author: Alfredo Deza <alfredo@deza.pe>
Date:   Wed May 28 11:48:12 2014 -0400

    add backport of collections.Counter for python2.6
    
    Using Raymond Hettinger's MIT backport
    
    Signed-off-by: Alfredo Deza <alfredo.deza@inktank.com>
    (cherry picked from commit 23b75b550507438c79b3aa75e06721e5f7b134a4)

commit 0b00443eec4c372f2ef245f85dc7c1f497ba3778
Author: Ailing <ailzhang@users.noreply.github.com>
Date:   Wed May 28 12:37:48 2014 -0700

    rest-api: key missing for per "rx" and "rwx"
    
    commit 85a1cf31e6 and db266a3fb2 introduce new per "rx" and "rwx", but key missing for per "rx" and "rwx" in permmap
    
    Signed-off-by: Ailing Zhang <ailzhang@cisco.com>
    (cherry picked from commit 0b5a67410793ec28cac47e6e44cbbcf5684d77e7)

commit a898ee56e01f971c12c0f7bebc22e59f850f27c0
Author: Greg Farnum <greg@inktank.com>
Date:   Wed May 21 21:41:23 2014 -0700

    cephfs-java: build against older jni headers
    
    Older versions of the JNI interface expected non-const parameters
    to their memory move functions. It's unpleasant, but won't actually
    change the memory in question, to do a cast_const in order to satisfy
    those older headers. (And even if it *did* modify the memory, that
    would be okay given our single user.)
    
    Signed-off-by: Greg Farnum <greg@inktank.com>
    (cherry picked from commit 4d4b77e5b6b923507ec4a0ad9d5c7018e4542a3c)

commit 8a12a940817d957063c21ac71a6128f991801573
Author: Ilya Dryomov <ilya.dryomov@inktank.com>
Date:   Fri May 16 19:03:13 2014 +0400

    OSDMonitor: set next commit in mon primary-affinity reply
    
    Commit 8c5c55c8b47e ("mon: set next commit in mon command replies")
    fixed MMonCommand replies to include the right version, but the
    primary-affinity handler was authored before that.  Fix it.
    
    Backport: firefly
    Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
    (cherry picked from commit a78b14ec1769ef37bef82bfda6faabb581b4cd7d)

commit 6ba57da94a6e00040677d6e43abf10a36ed9a931
Author: Dmitry Smirnov <onlyjob@member.fsf.org>
Date:   Mon May 12 14:08:44 2014 +1000

    prioritise use of `javac` executable (gcj provides it through alternatives).
    
     On Debian this fixes FTBFS when gcj-jdk and openjdk-7-jdk are installed at
     the same time because build system will use default `javac` executable
     provided by current JDK through `update-alternatives` instead of blindly
     calling GCJ when it is present.
    
    Signed-off-by: Dmitry Smirnov <onlyjob@member.fsf.org>
    (cherry picked from commit 8b682d167e4535df582f1c77542e2b1ea0981228)

commit 9e335a494c6eff209cff64bd663b5aa2a7bbc242
Author: Dmitry Smirnov <onlyjob@member.fsf.org>
Date:   Mon May 12 14:02:53 2014 +1000

    pass '-classpath' option (gcj/javah ignores CLASSPATH environment variable).
    
     This should not affect OpenJDK which understands '-classpath' as well.
    
     With gcj-jdk we still get FTBFS later:
    
     ~~~~
        java/native/libcephfs_jni.cc:2878:55: error: invalid conversion from 'const jbyte* {aka const signed char*}' to 'jbyte* {aka signed char*}' [-fpermissive]
                     reinterpret_cast<const jbyte*>(rawAddress));
                                                               ^
        In file included from java/native/libcephfs_jni.cc:27:0:
        /usr/lib/gcc/x86_64-linux-gnu/4.8/include/jni.h:1471:8: error:   initializing argument 4 of 'void _Jv_JNIEnv::SetByteArrayRegion(jbyteArray, jsize, jsize, jbyte*)' [-fpermissive]
           void SetByteArrayRegion (jbyteArray val0, jsize val1, jsize val2, jbyte * val3)
                ^
        make[5] *** [java/native/libcephfs_jni_la-libcephfs_jni.lo] Error 1
     ~~~~
    
    Signed-off-by: Dmitry Smirnov <onlyjob@member.fsf.org>
    (cherry picked from commit 89fe0353582bde7e2fbf32f1626d430a20002dd0)

commit fcd30500790eac0266ffb70d83ee17b23aeaf209
Author: Dmitry Smirnov <onlyjob@member.fsf.org>
Date:   Mon May 12 13:57:20 2014 +1000

    look for "jni.h" in gcj-jdk path, needed to find "jni.h" with gcj-jdk_4.9.0
    
    Signed-off-by: Dmitry Smirnov <onlyjob@member.fsf.org>
    (cherry picked from commit 0f4120c0115e7977ae7c03458addcc2b2916db07)

commit de43f6d2d813d2c7e5cf915c1b9037fe662d6afc
Author: Sage Weil <sage@inktank.com>
Date:   Thu May 8 08:52:51 2014 -0700

    ceph-disk: partprobe before settle when preparing dev
    
    Two users have reported this fixes a problem with using --dmcrypt.
    
    Fixes: #6966
    Tested-by: Eric Eastman <eric0e@aol.com>
    Signed-off-by: Sage Weil <sage@inktank.com>
    (cherry picked from commit 0f196265f049d432e399197a3af3f90d2e916275)

commit fe1fbfb7a43d6590efce99711e47f986249f0956
Author: Greg Farnum <greg@inktank.com>
Date:   Tue May 13 13:15:28 2014 -0700

    test: fix some templates to match new output code
    
    Signed-off-by: Greg Farnum <greg@inktank.com>
    Reviewed-by: Samuel Just <sam.just@inktank.com>
    (cherry picked from commit 00225d739cefa1415524a3de45fb9a5a2db53018)

commit 5c8afaa8861345efbcc5488e0336327a8a38d3bc
Author: Greg Farnum <greg@inktank.com>
Date:   Thu May 15 16:50:43 2014 -0700

    OSD: fix an osdmap_subscribe interface misuse
    
    When calling osdmap_subscribe, you have to pass an epoch newer than the
    current map's. _maybe_boot() was not doing this correctly -- we would
    fail a check for being *in* the monitor's existing map range, and then
    pass along the map prior to the monitor's range. But if we were exactly
    one behind, that value would be our current epoch, and the request would
    get dropped. So instead, make sure we are not *in contact* with the monitor's
    existing map range.
    
    Signed-off-by: Greg Farnum <greg@inktank.com>
    Reviewed-by: Samuel Just <sam.just@inktank.com>
    (cherry picked from commit 290ac818696414758978b78517b137c226110bb4)

commit eb98f4ab3a27aa8e00e0eb7e504ca7bec7c48a06
Author: Sage Weil <sage@inktank.com>
Date:   Mon May 19 10:32:12 2014 -0700

    osd: skip out of order op checks on tiered pools
    
    When we send redirected ops, we do not assign a new tid, which means that
    a given client's ops for a pool may not have strictly ordered tids.  Skip
    this check if the pool is tiered to avoid false positives.
    
    Fixes: #8380
    Signed-off-by: Sage Weil <sage@inktank.com>
    (cherry picked from commit cf2b172c843da0599164901956b66c306a59e570)

commit 29ee6faecb9e16c63acae8318a7c8f6b14367af7
Author: Samuel Just <sam.just@inktank.com>
Date:   Tue May 6 11:50:14 2014 -0700

    ReplicatedPG: block scrub on blocked object contexts
    
    Fixes: #8011
    Backport: firefly
    Signed-off-by: Samuel Just <sam.just@inktank.com>
    (cherry picked from commit 7411477153219d66625a74c5886530029c516036)

commit 6078726e0b89d0202c3a4bc594be11fc346bed9d
Author: Guang Yang <yguang@yahoo-inc.com>
Date:   Fri May 9 09:21:23 2014 +0000

    msg: Fix inconsistent message sequence negotiation during connection reset
    
    Backport: firefly, emperor, dumpling
    
    Signed-off-by: Guang Yang (yguang@yahoo-inc.com)
    Reviewed-by: Greg Farnum <greg@inktank.com>
    (cherry picked from commit bdee119076dd0eb65334840d141ccdf06091e3c9)

commit 02557f8bc05ff28013e241611cb046b28f97b4c6
Author: Samuel Just <sam.just@inktank.com>
Date:   Tue Apr 15 12:55:47 2014 -0700

    Objecter::_op_submit: only replace the tid if it's 0
    
    Otherwise, redirected ops will suddenly have a different tid
    and will become uncancelable.
    
    Fixes: #7588
    Signed-off-by: Samuel Just <sam.just@inktank.com>
    (cherry picked from commit 76568aa0db4e16ac1af8fe6405edade1e61cbc81)

commit 788b5fad515c48d4028f5a67d63052e373c81e66
Author: Sage Weil <sage@inktank.com>
Date:   Thu May 8 10:42:42 2014 -0700

    mon/OSDMonitor: force op resend when pool overlay changes
    
    If a client is sending a sequence of ops (say, a, b, c, d) and partway
    through that sequence it receives an OSDMap update that changes the
    overlay, the ops will get send to different pools, and the replies will
    come back completely out of order.
    
    To fix this, force a resend of all outstanding ops any time the overlay
    changes.
    
    Fixes: #8305
    Signed-off-by: Sage Weil <sage@inktank.com>
    (cherry picked from commit 63d92ab0969357f78fdade749785136a509bc81b)

commit 268df4862d95bf506ef6f594fdfa8294671babc3
Author: Sage Weil <sage@inktank.com>
Date:   Thu May 8 10:50:51 2014 -0700

    osd: discard client ops sent before last_force_op_resend
    
    If an op is sent before last_force_op_resend, and the client's feature is
    present, drop the op because we know they will resend.
    
    Signed-off-by: Sage Weil <sage@inktank.com>
    (cherry picked from commit 45e79a17a932192995f8328ae9f6e8a2a6348d10)

commit 8bc4992f434ed0b180d5e4a293d8191f4846358c
Author: Sage Weil <sage@inktank.com>
Date:   Thu May 8 10:52:11 2014 -0700

    osdc/Objecter: resend ops in the last_force_op_resend epoch
    
    If we are a client, and process a map that sets last_force_op_resend to
    the current epoch, force a resend of this op.
    
    If the OSD expects us to do this, it will discard our previous op.  If the
    OSD is old, it will process the old one, this will appear as a dup, and we
    are no worse off than before.
    
    Signed-off-by: Sage Weil <sage@inktank.com>
    (cherry picked from commit dd700bdf7115223cb3e517b851f462d75dd76a2b)

commit 83d03f0e1c65385dcf465108d544da84f8bfad97
Author: Sage Weil <sage@inktank.com>
Date:   Thu May 8 10:40:10 2014 -0700

    osd/osd_types: add last_force_op_resend to pg_pool_t
    
    Signed-off-by: Sage Weil <sage@inktank.com>
    (cherry picked from commit 3152faf79f498a723ae0fe44301ccb21b15a96ab)

commit c94ac44ab41fc62add3fc93c5c7ce06950eed3f1
Author: Sage Weil <sage@inktank.com>
Date:   Fri May 9 09:20:34 2014 -0700

    osd: handle race between osdmap and prepare_to_stop
    
    If we get a MOSDMarkMeDown message and set service.state == STOPPING, we
    kick the prepare_to_stop() thread.  Normally, it will wake up and then
    set osd.state == STOPPING, and when we process the map message next we
    will not warn.  However, if dispatch() takes the lock instead and processes
    the map, it will fail the preparing_to_stop check and issue a spurious
    warning.
    
    Fix by checking for either preparing_to_stop or stopping.
    
    Fixes: #8319
    Backport: firefly, emperor, dumpling
    Signed-off-by: Sage Weil <sage@inktank.com>
    (cherry picked from commit 6b858be0676f937a99dbd51321497f30c3a0097f)

commit 22e2e7cff42970b00dc352513f1f138132f78d04
Author: Sage Weil <sage@inktank.com>
Date:   Sat May 10 10:29:11 2014 -0700

    osd/ReplicatedPG: do not queue NULL dup_op
    
    We call start_flush() with a NULL op in a couple different places.  Do not
    put a NULL pointer on the dup_ops list or we will crash later.
    
    Fixes: #8328
    Signed-off-by: Sage Weil <sage@inktank.com>
    (cherry picked from commit 0d67f9b0695765824bdc4a65fbed88edf8ea232e)