The patch titled
Subject: ocfs2-dlm-fix-a-race-between-purge-and-migratio-v2
has been added to the -mm tree. Its filename is
ocfs2-dlm-fix-a-race-between-purge-and-migratio-v2.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/ocfs2-dlm-fix-a-race-between-purge-and-migratio-v2.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/ocfs2-dlm-fix-a-race-between-purge-and-migratio-v2.patch
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------------------------------------------------------
From: Xue jiufei <xuejiufei@xxxxxxxxxx>
Subject: ocfs2-dlm-fix-a-race-between-purge-and-migratio-v2
Signed-off-by: Jiufei Xue <xuejiufei@xxxxxxxxxx>
Reviewed-by: Joseph Qi <joseph.qi@xxxxxxxxxx>
Cc: Yiwen Jiang <jiangyiwen@xxxxxxxxxx>
Cc: Mark Fasheh <mfasheh@xxxxxxx>
Cc: Joel Becker <jlbec@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/ocfs2/dlm/dlmrecovery.c | 31 ++++++++-----------------------
1 file changed, 8 insertions(+), 23 deletions(-)
diff -puN fs/ocfs2/dlm/dlmrecovery.c~ocfs2-dlm-fix-a-race-between-purge-and-migratio-v2 fs/ocfs2/dlm/dlmrecovery.c
--- a/fs/ocfs2/dlm/dlmrecovery.c~ocfs2-dlm-fix-a-race-between-purge-and-migratio-v2
+++ a/fs/ocfs2/dlm/dlmrecovery.c
@@ -1373,6 +1373,7 @@ int dlm_mig_lockres_handler(struct o2net
char *buf = NULL;
struct dlm_work_item *item = NULL;
struct dlm_lock_resource *res = NULL;
+ unsigned int hash;
if (!dlm_grab(dlm))
return -EINVAL;
@@ -1400,33 +1401,14 @@ int dlm_mig_lockres_handler(struct o2net
/* lookup the lock to see if we have a secondary queue for this
* already... just add the locks in and this will have its owner
* and RECOVERY flag changed when it completes. */
-way_up_top:
- res = dlm_lookup_lockres(dlm, mres->lockname, mres->lockname_len);
+ hash = dlm_lockid_hash(mres->lockname, mres->lockname_len);
+ spin_lock(&dlm->spinlock);
+ res = __dlm_lookup_lockres(dlm, mres->lockname, mres->lockname_len,
+ hash);
if (res) {
/* this will get a ref on res */
/* mark it as recovering/migrating and hash it */
spin_lock(&res->spinlock);
-
- /*
- * Right after dlm spinlock was released, dlm_thread could have
- * purged the lockres. Check if lockres got unhashed. If so
- * start over.
- */
- if (hlist_unhashed(&res->hash_node)) {
- spin_unlock(&res->spinlock);
- dlm_lockres_put(res);
- goto way_up_top;
- }
-
- /* Wait on the resource purge to complete before continuing */
- if (res->state & DLM_LOCK_RES_DROPPING_REF) {
- __dlm_wait_on_lockres_flags(res,
- DLM_LOCK_RES_DROPPING_REF);
- spin_unlock(&res->spinlock);
- dlm_lockres_put(res);
- goto way_up_top;
- }
-
if (mres->flags & DLM_MRES_RECOVERY) {
res->state |= DLM_LOCK_RES_RECOVERING;
} else {
@@ -1443,13 +1425,16 @@ way_up_top:
mres->lockname_len, mres->lockname);
ret = -EFAULT;
spin_unlock(&res->spinlock);
+ spin_unlock(&dlm->spinlock);
dlm_lockres_put(res);
goto leave;
}
res->state |= DLM_LOCK_RES_MIGRATING;
}
spin_unlock(&res->spinlock);
+ spin_unlock(&dlm->spinlock);
} else {
+ spin_unlock(&dlm->spinlock);
/* need to allocate, just like if it was
* mastered here normally */
res = dlm_new_lockres(dlm, mres->lockname, mres->lockname_len);
_
Patches currently in -mm which might be from xuejiufei@xxxxxxxxxx are
ocfs2-dlm-fix-a-race-between-purge-and-migratio.patch
ocfs2-dlm-fix-a-race-between-purge-and-migratio-v2.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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