ocfs2: Add ->check_downconvert callback in dlmglue
This will allow lock types to force a requeue of a lock downconvert. Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
This commit is contained in:
parent
f7fbfdd1fc
commit
16d5b9567a
|
@ -118,6 +118,18 @@ struct ocfs2_lock_res_ops {
|
|||
int (*unblock)(struct ocfs2_lock_res *, struct ocfs2_unblock_ctl *);
|
||||
void (*post_unlock)(struct ocfs2_super *, struct ocfs2_lock_res *);
|
||||
|
||||
/*
|
||||
* Allow a lock type to add checks to determine whether it is
|
||||
* safe to downconvert a lock. Return 0 to re-queue the
|
||||
* downconvert at a later time, nonzero to continue.
|
||||
*
|
||||
* For most locks, the default checks that there are no
|
||||
* incompatible holders are sufficient.
|
||||
*
|
||||
* Called with the lockres spinlock held.
|
||||
*/
|
||||
int (*check_downconvert)(struct ocfs2_lock_res *, int);
|
||||
|
||||
/*
|
||||
* LOCK_TYPE_* flags which describe the specific requirements
|
||||
* of a lock type. Descriptions of each individual flag follow.
|
||||
|
@ -2657,6 +2669,12 @@ recheck:
|
|||
&& (lockres->l_flags & OCFS2_LOCK_REFRESHING))
|
||||
goto leave_requeue;
|
||||
|
||||
new_level = ocfs2_highest_compat_lock_level(lockres->l_blocking);
|
||||
|
||||
if (lockres->l_ops->check_downconvert
|
||||
&& !lockres->l_ops->check_downconvert(lockres, new_level))
|
||||
goto leave_requeue;
|
||||
|
||||
/* If we get here, then we know that there are no more
|
||||
* incompatible holders (and anyone asking for an incompatible
|
||||
* lock is blocked). We can now downconvert the lock */
|
||||
|
@ -2684,7 +2702,6 @@ recheck:
|
|||
|
||||
downconvert:
|
||||
ctl->requeue = 0;
|
||||
new_level = ocfs2_highest_compat_lock_level(lockres->l_blocking);
|
||||
|
||||
ocfs2_prepare_downconvert(lockres, new_level);
|
||||
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
||||
|
|
Loading…
Reference in a new issue