BMC/Intel-BMC/linux.git/fs/ocfs2/dlm/dlmthread.c, branch dev

ocfs2/dlm: do not purge lockres that is queued for assert master

2014-06-23T23:47:45+00:00

When workqueue is delayed, it may occur that a lockres is purged while it is still queued for master assert. it may trigger BUG() as follows. N1 N2 dlm_get_lockres() ->dlm_do_master_requery is the master of lockres, so queue assert_master work dlm_thread() start running and purge the lockres dlm_assert_master_worker() send assert master message to other nodes receiving the assert_master message, set master to N2 dlmlock_remote() send create_lock message to N2, but receive DLM_IVLOCKID, if it is RECOVERY lockres, it triggers the BUG(). Another BUG() is triggered when N3 become the new master and send assert_master to N1, N1 will trigger the BUG() because owner doesn't match. So we should not purge lockres when it is queued for assert master. Signed-off-by: joyce.xue Reviewed-by: Mark Fasheh Cc: Joel Becker Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

ocfs2/dlm: fix misuse of list_move_tail() in dlm_run_purge_list()

2014-06-23T23:47:45+00:00

When a lockres in purge list but is still in use, it should be moved to the tail of purge list. dlm_thread will continue to check next lockres in purge list. However, code list_move_tail(&dlm->purge_list, &lockres->purge) will do *no* movements, so dlm_thread will purge the same lockres in this loop again and again. If it is in use for a long time, other lockres will not be processed. Signed-off-by: Yiwen Jiang Signed-off-by: joyce.xue Reviewed-by: Mark Fasheh Cc: Joel Becker Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

ocfs2: use list_for_each_entry() instead of list_for_each()

2013-09-11T22:56:36+00:00

[dan.carpenter@oracle.com: fix up some NULL dereference bugs] Signed-off-by: Dong Fang Cc: Mark Fasheh Cc: Joel Becker Cc: Jeff Liu Signed-off-by: Dan Carpenter Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

ocfs2/dlm: Take inflight reference count for remotely mastered resources too

2011-07-24T17:29:54+00:00

The inflight reference count, in the lock resource, is taken to pin the resource in memory. We take it when a new resource is created and release it after a lock is attached to it. We do this to prevent the resource from getting purged prematurely. Earlier this reference count was being taken for locally mastered resources only. This patch extends the same functionality for remotely mastered ones. We are doing this because the same premature purging could occur for remotely mastered resources if the remote node were to die before completion of the create lock. Fix for Oracle bug#12405575. Signed-off-by: Sunil Mushran

ocfs2/dlm: Trace insert/remove of resource to/from hash

2011-07-24T17:27:54+00:00

Add mlog to trace adding and removing the resource from/to the hash table. Signed-off-by: Sunil Mushran

ocfs2/dlm: Clean up messages in o2dlm

2011-07-24T17:23:54+00:00

o2dlm messages needed a facelift. Signed-off-by: Sunil Mushran

ocfs2/dlm: Cleanup mlogs in dlmthread.c, dlmast.c and dlmdomain.c

2010-12-16T08:46:05+00:00

Add the domain name and the resource name in the mlogs. Signed-off-by: Sunil Mushran Signed-off-by: Joel Becker

ocfs2/dlm: avoid incorrect bit set in refmap on recovery master

2010-08-07T17:49:41+00:00

In the following situation, there remains an incorrect bit in refmap on the recovery master. Finally the recovery master will fail at purging the lockres due to the incorrect bit in refmap. 1) node A has no interest on lockres A any longer, so it is purging it. 2) the owner of lockres A is node B, so node A is sending de-ref message to node B. 3) at this time, node B crashed. node C becomes the recovery master. it recovers lockres A(because the master is the dead node B). 4) node A migrated lockres A to node C with a refbit there. 5) node A failed to send de-ref message to node B because it crashed. The failure is ignored. no other action is done for lockres A any more. For mormal, re-send the deref message to it to recovery master can fix it. Well, ignoring the failure of deref to the original master and not recovering the lockres to recovery master has the same effect. And the later is simpler. Signed-off-by: Wengang Wang Acked-by: Srinivas Eeda Cc: stable@kernel.org Signed-off-by: Joel Becker

ocfs2 fix o2dlm dlm run purgelist (rev 3)

2010-08-07T17:44:40+00:00

This patch fixes two problems in dlm_run_purgelist 1. If a lockres is found to be in use, dlm_run_purgelist keeps trying to purge the same lockres instead of trying the next lockres. 2. When a lockres is found unused, dlm_run_purgelist releases lockres spinlock before setting DLM_LOCK_RES_DROPPING_REF and calls dlm_purge_lockres. spinlock is reacquired but in this window lockres can get reused. This leads to BUG. This patch modifies dlm_run_purgelist to skip lockres if it's in use and purge next lockres. It also sets DLM_LOCK_RES_DROPPING_REF before releasing the lockres spinlock protecting it from getting reused. Signed-off-by: Srinivas Eeda Acked-by: Sunil Mushran Cc: stable@kernel.org Signed-off-by: Joel Becker

Merge branch 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jlbec/ocfs2

2010-05-21T14:20:17+00:00

* 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jlbec/ocfs2: (47 commits) ocfs2: Silence a gcc warning. ocfs2: Don't retry xattr set in case value extension fails. ocfs2:dlm: avoid dlm->ast_lock lockres->spinlock dependency break ocfs2: Reset xattr value size after xa_cleanup_value_truncate(). fs/ocfs2/dlm: Use kstrdup fs/ocfs2/dlm: Drop memory allocation cast Ocfs2: Optimize punching-hole code. Ocfs2: Make ocfs2_find_cpos_for_left_leaf() public. Ocfs2: Fix hole punching to correctly do CoW during cluster zeroing. Ocfs2: Optimize ocfs2 truncate to use ocfs2_remove_btree_range() instead. ocfs2: Block signals for mkdir/link/symlink/O_CREAT. ocfs2: Wrap signal blocking in void functions. ocfs2/dlm: Increase o2dlm lockres hash size ocfs2: Make ocfs2_extend_trans() really extend. ocfs2/trivial: Code cleanup for allocation reservation. ocfs2: make ocfs2_adjust_resv_from_alloc simple. ocfs2: Make nointr a default mount option ocfs2/dlm: Make o2dlm domain join/leave messages KERN_NOTICE o2net: log socket state changes ocfs2: print node # when tcp fails ...