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ocfs2: Add ->check_downconvert callback in dlmglue

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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:
Mark Fasheh 2006-09-13 21:10:12 -07:00
parent f7fbfdd1fc
commit 16d5b9567a
1 changed files with 18 additions and 1 deletions
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19
fs/ocfs2/dlmglue.c
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@ -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);