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| author | Wengang Wang <wen.gang.wang@oracle.com> | 2010-07-14 22:38:21 +0800 |
|---|---|---|
| committer | Joel Becker <joel.becker@oracle.com> | 2010-07-15 10:56:30 -0700 |
| commit | a39953dd95ff10e311083d94f4f95c348cb22464 (patch) | |
| tree | c905adf070262a6782d7a1b664495c36fbe95fab /fs/ocfs2/dlm | |
| parent | f5e27b6ddfbafdd9c9c2f06bbf28af12581409bc (diff) | |
| download | linux-a39953dd95ff10e311083d94f4f95c348cb22464.tar.gz linux-a39953dd95ff10e311083d94f4f95c348cb22464.tar.bz2 linux-a39953dd95ff10e311083d94f4f95c348cb22464.zip | |
ocfs2/dlm: Remove BUG_ON from migration in the rare case of a down node
For migration, we are waiting for DLM_LOCK_RES_MIGRATING flag to be set
before sending DLM_MIG_LOCKRES_MSG message to the target. We are using
dlm_migration_can_proceed() for that purpose. However, if the node is
down, dlm_migration_can_proceed() will also return "go ahead". In this
rare case, the DLM_LOCK_RES_MIGRATING flag might not be set yet. Remove
the BUG_ON() that trips over this condition.
Signed-off-by: Wengang Wang <wen.gang.wang@oracle.com>
Signed-off-by: Joel Becker <joel.becker@oracle.com>
Diffstat (limited to 'fs/ocfs2/dlm')
| -rw-r--r-- | fs/ocfs2/dlm/dlmmaster.c | 22 |
1 files changed, 14 insertions, 8 deletions
diff --git a/fs/ocfs2/dlm/dlmmaster.c b/fs/ocfs2/dlm/dlmmaster.c index 4a7506a4e314..94b97fc6a88e 100644 --- a/fs/ocfs2/dlm/dlmmaster.c +++ b/fs/ocfs2/dlm/dlmmaster.c @@ -2808,14 +2808,8 @@ again: mlog(0, "trying again...\n"); goto again; } - /* now that we are sure the MIGRATING state is there, drop - * the unneded state which blocked threads trying to DIRTY */ - spin_lock(&res->spinlock); - BUG_ON(!(res->state & DLM_LOCK_RES_BLOCK_DIRTY)); - BUG_ON(!(res->state & DLM_LOCK_RES_MIGRATING)); - res->state &= ~DLM_LOCK_RES_BLOCK_DIRTY; - spin_unlock(&res->spinlock); + ret = 0; /* did the target go down or die? */ spin_lock(&dlm->spinlock); if (!test_bit(target, dlm->domain_map)) { @@ -2826,9 +2820,21 @@ again: spin_unlock(&dlm->spinlock); /* + * if target is down, we need to clear DLM_LOCK_RES_BLOCK_DIRTY for + * another try; otherwise, we are sure the MIGRATING state is there, + * drop the unneded state which blocked threads trying to DIRTY + */ + spin_lock(&res->spinlock); + BUG_ON(!(res->state & DLM_LOCK_RES_BLOCK_DIRTY)); + res->state &= ~DLM_LOCK_RES_BLOCK_DIRTY; + if (!ret) + BUG_ON(!(res->state & DLM_LOCK_RES_MIGRATING)); + spin_unlock(&res->spinlock); + + /* * at this point: * - * o the DLM_LOCK_RES_MIGRATING flag is set + * o the DLM_LOCK_RES_MIGRATING flag is set if target not down * o there are no pending asts on this lockres * o all processes trying to reserve an ast on this * lockres must wait for the MIGRATING flag to clear |