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piaojun ee8f7fcbe6 ocfs2/dlm: continue to purge recovery lockres when recovery master goes down 
We found a dlm-blocked situation caused by continuous breakdown of
recovery masters described below.  To solve this problem, we should
purge recovery lock once detecting recovery master goes down.

N3                      N2                   N1(reco master)
                        go down
                                             pick up recovery lock and
                                             begin recoverying for N2

                                             go down

pick up recovery
lock failed, then
purge it:
dlm_purge_lockres
  ->DROPPING_REF is set

send deref to N1 failed,
recovery lock is not purged

find N1 go down, begin
recoverying for N1, but
blocked in dlm_do_recovery
as DROPPING_REF is set:
dlm_do_recovery
  ->dlm_pick_recovery_master
    ->dlmlock
      ->dlm_get_lock_resource
        ->__dlm_wait_on_lockres_flags(tmpres,
	  	DLM_LOCK_RES_DROPPING_REF);

Fixes: 8c03439681 ("ocfs2/dlm: clear DROPPING_REF flag when the master goes down")
Link: http://lkml.kernel.org/r/578453AF.8030404@huawei.com
Signed-off-by: Jun Piao <piaojun@huawei.com>
Reviewed-by: Joseph Qi <joseph.qi@huawei.com>
Reviewed-by: Jiufei Xue <xuejiufei@huawei.com>
Reviewed-by: Mark Fasheh <mfasheh@suse.de>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-08-02 17:31:41 -04:00
..
cluster Merge branch 'akpm' (patches from Andrew) 2016-07-26 19:55:54 -07:00
dlm ocfs2/dlm: continue to purge recovery lockres when recovery master goes down 2016-08-02 17:31:41 -04:00
dlmfs mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros 2016-04-04 10:41:08 -07:00
acl.c ocfs2: fix posix_acl_create deadlock 2016-05-12 15:52:50 -07:00
acl.h ocfs2: fix posix_acl_create deadlock 2016-05-12 15:52:50 -07:00
alloc.c ocfs2: retry on ENOSPC if sufficient space in truncate log 2016-08-02 17:31:41 -04:00
alloc.h ocfs2: retry on ENOSPC if sufficient space in truncate log 2016-08-02 17:31:41 -04:00
aops.c ocfs2: retry on ENOSPC if sufficient space in truncate log 2016-08-02 17:31:41 -04:00
aops.h ocfs2: fix ip_unaligned_aio deadlock with dio work queue 2016-03-25 16:37:42 -07:00
blockcheck.c ocfs2: kill endianness abuses in blockcheck.c 2012-05-29 23:28:35 -04:00
blockcheck.h
buffer_head_io.c Merge branch 'for-4.8/core' of git://git.kernel.dk/linux-block 2016-07-26 15:03:07 -07:00
buffer_head_io.h
dcache.c VFS: normal filesystems (and lustre): d_inode() annotations 2015-04-15 15:06:57 -04:00
dcache.h ocfs2: revert iput deferring code in ocfs2_drop_dentry_lock 2014-04-03 16:20:55 -07:00
dir.c wrappers for ->i_mutex access 2016-01-22 18:04:28 -05:00
dir.h VFS: normal filesystems (and lustre): d_inode() annotations 2015-04-15 15:06:57 -04:00
dlmglue.c ocfs2: remove obscure BUG_ON in dlmglue 2016-07-26 16:19:19 -07:00
dlmglue.h ocfs2: avoid blocking in ocfs2_mark_lockres_freeing() in downconvert thread 2014-04-03 16:20:55 -07:00
export.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2015-04-26 17:22:07 -07:00
export.h
extent_map.c ocfs2: neaten do_error, ocfs2_error and ocfs2_abort 2015-09-04 16:54:41 -07:00
extent_map.h
file.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2016-05-17 11:01:31 -07:00
file.h ocfs2: prepare some interfaces used in append direct io 2015-02-16 17:56:04 -08:00
filecheck.c ocfs2: sysfile interfaces for online file check 2016-03-22 15:36:02 -07:00
filecheck.h ocfs2: sysfile interfaces for online file check 2016-03-22 15:36:02 -07:00
heartbeat.c
heartbeat.h
inode.c ocfs2: fix improper handling of return errno 2016-05-26 15:35:44 -07:00
inode.h ocfs2: cleanup implemented prototypes 2016-07-26 16:19:19 -07:00
ioctl.c wrappers for ->i_mutex access 2016-01-22 18:04:28 -05:00
ioctl.h
journal.c ocfs2: improve recovery performance 2016-07-26 16:19:19 -07:00
journal.h jbd2: add support for avoiding data writes during transaction commits 2016-04-24 00:56:07 -04:00
Kconfig
localalloc.c ocfs2: fix occurring deadlock by changing ocfs2_wq from global to local 2016-03-25 16:37:42 -07:00
localalloc.h ocfs2: free allocated clusters if error occurs after ocfs2_claim_clusters 2014-02-06 13:48:51 -08:00
locks.c ocfs2: fix flock panic issue 2015-12-29 17:45:49 -08:00
locks.h
Makefile ocfs2: disable BUG assertions in reading blocks 2016-06-24 17:23:52 -07:00
mmap.c mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros 2016-04-04 10:41:08 -07:00
mmap.h
move_extents.c wrappers for ->i_mutex access 2016-01-22 18:04:28 -05:00
move_extents.h
namei.c ocfs2: fix posix_acl_create deadlock 2016-05-12 15:52:50 -07:00
namei.h ocfs2: do not include dio entry in case of orphan scan 2015-11-05 19:34:48 -08:00
ocfs1_fs_compat.h
ocfs2.h mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros 2016-04-04 10:41:08 -07:00
ocfs2_fs.h ocfs2: fix comment in struct ocfs2_extended_slot 2016-05-19 19:12:14 -07:00
ocfs2_ioctl.h
ocfs2_lockid.h
ocfs2_lockingver.h
ocfs2_trace.h ocfs2: code clean up for direct io 2016-03-25 16:37:42 -07:00
quota.h quota: constify qtree_fmt_operations structures 2016-01-04 10:58:35 +01:00
quota_global.c quota: use time64_t internally 2016-06-19 18:09:31 +02:00
quota_local.c ocfs2: neaten do_error, ocfs2_error and ocfs2_abort 2015-09-04 16:54:41 -07:00
refcounttree.c ocfs2: fix posix_acl_create deadlock 2016-05-12 15:52:50 -07:00
refcounttree.h ocfs2: fix NULL pointer dereference in ocfs2_duplicate_clusters_by_page 2013-08-13 17:57:49 -07:00
reservations.c ocfs2: make resv_lock spinlock static 2015-02-10 14:30:29 -08:00
reservations.h
resize.c ocfs2: solve a problem of crossing the boundary in updating backups 2016-03-25 16:37:42 -07:00
resize.h
slot_map.c ocfs2: clean up an unneeded goto in ocfs2_put_slot() 2016-05-19 19:12:14 -07:00
slot_map.h
stack_o2cb.c ocfs2: avoid a pointless delay in o2cb_cluster_check() 2015-04-14 16:48:57 -07:00
stack_user.c ocfs2: ensure that dlm lockspace is created by kernel module 2016-08-02 17:31:41 -04:00
stackglue.c ocfs2: fix a redundant re-initialization 2016-07-26 16:19:19 -07:00
stackglue.h ocfs2: export ocfs2_kset for online file check 2016-03-22 15:36:02 -07:00
suballoc.c ocfs2: retry on ENOSPC if sufficient space in truncate log 2016-08-02 17:31:41 -04:00
suballoc.h ocfs2: rollback alloc_dinode counts when ocfs2_block_group_set_bits() failed 2014-04-03 16:20:56 -07:00
super.c Merge branch 'akpm' (patches from Andrew) 2016-07-26 19:55:54 -07:00
super.h ocfs2: fix occurring deadlock by changing ocfs2_wq from global to local 2016-03-25 16:37:42 -07:00
symlink.c switch ->get_link() to delayed_call, kill ->put_link() 2015-12-30 13:01:03 -05:00
symlink.h ocfs: simplify symlink handling 2012-05-29 23:28:40 -04:00
sysfile.c ocfs2: avoid system inode ref confusion by adding mutex lock 2014-04-03 16:20:57 -07:00
sysfile.h
uptodate.c ocfs2: remove NULL assignments on static 2014-06-04 16:53:53 -07:00
uptodate.h
xattr.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2016-07-28 14:22:25 -07:00
xattr.h ocfs2: fix posix_acl_create deadlock 2016-05-12 15:52:50 -07:00