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  1. 15 1月, 2016 1 次提交
    • J
      ocfs2/dlm: wait until DLM_LOCK_RES_SETREF_INPROG is cleared in dlm_deref_lockres_worker · b5560143
      由 jiangyiwen 提交于 
      Commit f3f85464 ("ocfs2_dlm: Ensure correct ordering of set/clear
refmap bit on lockres") still exists a race which can't ensure the
ordering is exactly correct.

Node1               Node2                    Node3
umount, migrate
lockres to Node2
                    migrate finished,
                    send migrate request
                    to Node3
                                              received migrate request,
                                              create a migration_mle,
                                              respond to Node2.
                    set DLM_LOCK_RES_SETREF_INPROG
                    and send assert master to
                    Node3
                                              delete migration_mle in
                                              assert_master_handler,
                                              Node3 umount without response
                                              dlm_thread purge
                                              this lockres, send drop
                                              deref message to Node2
                    found the flag of
                    DLM_LOCK_RES_SETREF_INPROG
                    is set, dispatch
                    dlm_deref_lockres_worker to
                    clear refmap, but in function of
                    dlm_deref_lockres_worker,
                    only if node in refmap it wait
                    DLM_LOCK_RES_SETREF_INPROG
                    to be cleared. So worker is
                    done successfully

                                              purge lockres, send
                                              assert master response
                                              to Node1, and finish umount
                    set Node3 in refmap, and it
                    won't be cleared forever, thus
                    lead to umount hung

so wait until DLM_LOCK_RES_SETREF_INPROG is cleared in
dlm_deref_lockres_worker.
Signed-off-by: NYiwen Jiang <jiangyiwen@huawei.com>
Reviewed-by: NJoseph Qi <joseph.qi@huawei.com>
Reviewed-by: NJunxiao Bi <junxiao.bi@oracle.com>
Cc: Mark Fasheh <mfasheh@suse.de>
Cc: Joel Becker <jlbec@evilplan.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      b5560143
  3. 30 12月, 2015 1 次提交
    • X
      ocfs2/dlm: clear migration_pending when migration target goes down · cc28d6d8
      由 xuejiufei 提交于 
      We have found a BUG on res->migration_pending when migrating lock
resources.  The situation is as follows.

dlm_mark_lockres_migration
  res->migration_pending = 1;
  __dlm_lockres_reserve_ast
  dlm_lockres_release_ast returns with res->migration_pending remains
      because other threads reserve asts
  wait dlm_migration_can_proceed returns 1
  >>>>>>> o2hb found that target goes down and remove target
          from domain_map
  dlm_migration_can_proceed returns 1
  dlm_mark_lockres_migrating returns -ESHOTDOWN with
      res->migration_pending still remains.

When reentering dlm_mark_lockres_migrating(), it will trigger the BUG_ON
with res->migration_pending.  So clear migration_pending when target is
down.
Signed-off-by: NJiufei Xue <xuejiufei@huawei.com>
Reviewed-by: NJoseph Qi <joseph.qi@huawei.com>
Cc: Mark Fasheh <mfasheh@suse.de>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      cc28d6d8
  5. 23 10月, 2015 1 次提交
  7. 23 9月, 2015 1 次提交
  9. 05 9月, 2015 1 次提交
  11. 06 5月, 2015 1 次提交
    • J
      ocfs2: dlm: fix race between purge and get lock resource · b1432a2a
      由 Junxiao Bi 提交于 
      There is a race window in dlm_get_lock_resource(), which may return a
lock resource which has been purged.  This will cause the process to
hang forever in dlmlock() as the ast msg can't be handled due to its
lock resource not existing.

    dlm_get_lock_resource {
        ...
        spin_lock(&dlm->spinlock);
        tmpres = __dlm_lookup_lockres_full(dlm, lockid, namelen, hash);
        if (tmpres) {
             spin_unlock(&dlm->spinlock);
             >>>>>>>> race window, dlm_run_purge_list() may run and purge
                              the lock resource
             spin_lock(&tmpres->spinlock);
             ...
             spin_unlock(&tmpres->spinlock);
        }
    }
Signed-off-by: NJunxiao Bi <junxiao.bi@oracle.com>
Cc: Joseph Qi <joseph.qi@huawei.com>
Cc: Mark Fasheh <mfasheh@suse.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      b1432a2a
  13. 19 12月, 2014 1 次提交
  15. 11 12月, 2014 1 次提交
    • S
      ocfs2: o2dlm: fix a race between purge and master query · cb79662b
      由 Srinivas Eeda 提交于 
      Node A sends master query request to node B which is the master.  At this
time lockres happens to be on purgelist.  dlm_master_request_handler gets
the dlm spinlock, finds the resource and releases the dlm spin lock.
Right at this dlm_thread on this node could purge the lockres.
dlm_master_request_handler can then acquire lockres spinlock and reply to
Node A that node B is the master even though lockres on node B is purged.

The above scenario will now make node A falsely think node B is the master
which is inconsistent.  Further if another node C tries to master the same
resource, every node will respond they are not the master.  Node C then
masters the resource and sends assert master to all nodes.  This will now
make node A crash with the following message.

dlm_assert_master_handler:1831 ERROR: DIE! Mastery assert from 9, but current
owner is 10!
Signed-off-by: NSrinivas Eeda <srinivas.eeda@oracle.com>
Cc: Mark Fasheh <mfasheh@suse.com>
Cc: Joel Becker <jlbec@evilplan.org>
Reviewed-by: NWengang Wang <wen.gang.wang@oracle.com>
Tested-by: NJoseph Qi <joseph.qi@huawei.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      cb79662b
  17. 10 10月, 2014 1 次提交
  19. 03 10月, 2014 1 次提交
  21. 26 9月, 2014 1 次提交
  23. 07 8月, 2014 1 次提交
    • T
      ocfs2: race between umount and unfinished remastering during recovery · bba1cb17
      由 Tariq Saeed 提交于 
      Orabug: 19074140

When umount is issued during recovery on the new master that has not
finished remastering locks, it triggers BUG() in
dlm_send_mig_lockres_msg().  Here is the situation:

 1) node A has a lock on resource X mastered by node B.

 2) node B dies ->  node A sets recovering flag for res X

 3) Node C becomes the new master for resources owned by the
    dead node and is remastering locks of the dead node but
    has not finished the remastering process yet.

 4) umount is issued on node C.

 5) During processing of umount, ignoring unfished recovery,
    node C attempts to migrate resource X to node A.

 6) node A finds res X in DLM_LOCK_RES_RECOVERING state, considers
    it a logic error and sends back -EFAULT.

 7) node C asserts BUG() upon seeing EFAULT resp from node B.

Fix is to delay migrating res X till remastering is finished at which
point recovering flag will be cleared on both A and C.
Signed-off-by: NTariq Saeed <tariq.x.saeed@oracle.com>
Cc: Mark Fasheh <mfasheh@suse.com>
Cc: Joel Becker <jlbec@evilplan.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      bba1cb17
  25. 24 6月, 2014 2 次提交
  27. 05 6月, 2014 1 次提交
  29. 24 5月, 2014 1 次提交
  31. 13 11月, 2013 2 次提交
  33. 12 9月, 2013 1 次提交
  35. 26 2月, 2013 1 次提交
  37. 25 7月, 2011 3 次提交
  39. 26 5月, 2011 1 次提交
    • S
      ocfs2/dlm: Do not migrate resource to a node that is leaving the domain · 66effd3c
      由 Sunil Mushran 提交于 
      During dlm domain shutdown, o2dlm has to free all the lock resources. Ones that
have no locks and references are freed. Ones that have locks and/or references
are migrated to another node.

The first task in migration is finding a target. Currently we scan the lock
resource and find one node that either has a lock or a reference. This is not
very efficient in a parallel umount case as we might end up migrating the
lock resource to a node which itself may have to migrate it to a third node.

The patch scans the dlm->exit_domain_map to ensure the target node is not
leaving the domain. If no valid target node is found, o2dlm does not migrate
the resource but instead waits for the unlock and deref messages that will
allow it to free the resource.
Signed-off-by: NSunil Mushran <sunil.mushran@oracle.com>
Signed-off-by: NJoel Becker <jlbec@evilplan.org>
      66effd3c
  41. 24 5月, 2011 1 次提交
  43. 14 5月, 2011 1 次提交
  45. 31 3月, 2011 1 次提交
  47. 21 2月, 2011 1 次提交
    • T
      ocfs2: Remove ENTRY from masklog. · ef6b689b
      由 Tao Ma 提交于 
      ENTRY is used to record the entry of a function.
But because it is added in so many functions, if we enable it,
the system logs get filled up quickly and cause too much I/O.
So actually no one can open it for a production system or even
for a test.

So for mlog_entry_void, we just remove it.
for mlog_entry(...), we replace it with mlog(0,...), and they
will be replace by trace event later.
Signed-off-by: NTao Ma <boyu.mt@taobao.com>
      ef6b689b
  49. 10 12月, 2010 1 次提交
    • S
      ocfs2/dlm: Migrate lockres with no locks if it has a reference · 388c4bcb
      由 Sunil Mushran 提交于 
      o2dlm was not migrating resources with zero locks because it assumed that that
resource would get purged by dlm_thread. However, some usage patterns involve
creating and dropping locks at a high rate leading to the migrate thread seeing
zero locks but the purge thread seeing an active reference. When this happens,
the dlm_thread cannot purge the resource and the migrate thread sees no reason
to migrate that resource. The spell is broken when the migrate thread catches
the resource with a lock.

The fix is to make the migrate thread also consider the reference map.

This usage pattern can be triggered by userspace on userdlm locks and flocks.
Signed-off-by: NSunil Mushran <sunil.mushran@oracle.com>
Signed-off-by: NJoel Becker <joel.becker@oracle.com>
      388c4bcb
  51. 24 9月, 2010 1 次提交
  53. 08 8月, 2010 2 次提交
    • W
      ocfs2/dlm: remove potential deadlock -V3 · b11f1f1a
      由 Wengang Wang 提交于 
      When we need to take both dlm_domain_lock and dlm->spinlock, we should take
them in order of: dlm_domain_lock then dlm->spinlock.

There is pathes disobey this order. That is calling dlm_lockres_put() with
dlm->spinlock held in dlm_run_purge_list. dlm_lockres_put() calls dlm_put() at
the ref and dlm_put() locks on dlm_domain_lock.

Fix:
Don't grab/put the dlm when the initialising/releasing lockres.
That grab is not required because we don't call dlm_unregister_domain()
based on refcount.
Signed-off-by: NWengang Wang <wen.gang.wang@oracle.com>
Cc: stable@kernel.org
Signed-off-by: NJoel Becker <joel.becker@oracle.com>
      b11f1f1a
    • W
      ocfs2/dlm: fix a dead lock · 6d98c3cc
      由 Wengang Wang 提交于 
      When we have to take both dlm->master_lock and lockres->spinlock,
take them in order

lockres->spinlock and then dlm->master_lock.

The patch fixes a violation of the rule.
We can simply move taking dlm->master_lock to where we have dropped res->spinlock
since when we access res->state and free mle memory we don't need master_lock's
protection.
Signed-off-by: NWengang Wang <wen.gang.wang@oracle.com>
Cc: stable@kernel.org
Signed-off-by: NJoel Becker <joel.becker@oracle.com>
      6d98c3cc
  55. 16 7月, 2010 1 次提交
  57. 19 5月, 2010 1 次提交
  59. 06 5月, 2010 1 次提交
  61. 24 3月, 2010 1 次提交
  63. 26 1月, 2010 1 次提交
  65. 04 12月, 2009 1 次提交
  67. 24 9月, 2009 1 次提交
  69. 04 4月, 2009 1 次提交