The patch titled
Subject: ocfs2/dlm: clear migration_pending when migration target goes down
has been added to the -mm tree. Its filename is
ocfs2-dlm-clear-migration_pending-when-migration-target-goes-down.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/ocfs2-dlm-clear-migration_pending-when-migration-target-goes-down.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/ocfs2-dlm-clear-migration_pending-when-migration-target-goes-down.patch
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------------------------------------------------------
From: xuejiufei <xuejiufei@xxxxxxxxxx>
Subject: ocfs2/dlm: clear migration_pending when migration target goes down
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: Jiufei Xue <xuejiufei@xxxxxxxxxx>
Reviewed-by: Joseph Qi <joseph.qi@xxxxxxxxxx>
Cc: Mark Fasheh <mfasheh@xxxxxxx>
Cc: Joel Becker <jlbec@xxxxxxxxxxxx>
Cc: Junxiao Bi <junxiao.bi@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/ocfs2/dlm/dlmmaster.c | 2 ++
1 file changed, 2 insertions(+)
diff -puN fs/ocfs2/dlm/dlmmaster.c~ocfs2-dlm-clear-migration_pending-when-migration-target-goes-down fs/ocfs2/dlm/dlmmaster.c
--- a/fs/ocfs2/dlm/dlmmaster.c~ocfs2-dlm-clear-migration_pending-when-migration-target-goes-down
+++ a/fs/ocfs2/dlm/dlmmaster.c
@@ -2843,6 +2843,8 @@ again:
res->state &= ~DLM_LOCK_RES_BLOCK_DIRTY;
if (!ret)
BUG_ON(!(res->state & DLM_LOCK_RES_MIGRATING));
+ else
+ res->migration_pending = 0;
spin_unlock(&res->spinlock);
/*
_
Patches currently in -mm which might be from xuejiufei@xxxxxxxxxx are
ocfs2-dlm-clear-migration_pending-when-migration-target-goes-down.patch
ocfs2-dlm-fix-a-race-between-purge-and-migratio.patch
ocfs2-dlm-fix-a-race-between-purge-and-migratio-v2.patch
ocfs2-dlm-return-appropriate-value-when-dlm_grab-returns-null.patch
ocfs2-extend-transaction-for-ocfs2_remove_rightmost_path-and-ocfs2_update_edge_lengths-before-to-avoid-inconsistency-between-inode-and-et.patch
extend-enough-credits-for-freeing-one-truncate-record-while-replaying-truncate-records.patch
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