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ocfs2: Teach ocfs2_drop_lock() to use ->set_lvb() callback 

With this, we don't need to pass an additional struct with function pointer.

Now that the callbacks are fully used, comment the remaining API.

Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
This commit is contained in:
Mark Fasheh 2006-09-14 14:44:51 -07:00
parent b5e500e23e
commit 0d5dc6c2dd
1 changed files with 28 additions and 31 deletions
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59
fs/ocfs2/dlmglue.c
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@ -107,6 +107,14 @@ static void ocfs2_dentry_post_unlock(struct ocfs2_super *osb,
* OCFS2 Lock Resource Operations
*
* These fine tune the behavior of the generic dlmglue locking infrastructure.
*
* The most basic of lock types can point ->l_priv to their respective
* struct ocfs2_super and allow the default actions to manage things.
*
* Right now, each lock type also needs to implement an init function,
* and trivial lock/unlock wrappers. ocfs2_simple_drop_lockres()
* should be called when the lock is no longer needed (i.e., object
* destruction time).
*/
struct ocfs2_lock_res_ops {
/*
@ -115,6 +123,15 @@ struct ocfs2_lock_res_ops {
*/
struct ocfs2_super * (*get_osb)(struct ocfs2_lock_res *);
/*
* Optionally called in the downconvert (or "vote") thread
* after a successful downconvert. The lockres will not be
* referenced after this callback is called, so it is safe to
* free memory, etc.
*
* The exact semantics of when this is called are controlled
* by ->downconvert_worker()
*/
void (*post_unlock)(struct ocfs2_super *, struct ocfs2_lock_res *);
/*
@ -2230,16 +2247,8 @@ complete_unlock:
mlog_exit_void();
}
typedef void (ocfs2_pre_drop_cb_t)(struct ocfs2_lock_res *, void *);
struct drop_lock_cb {
ocfs2_pre_drop_cb_t *drop_func;
void *drop_data;
};
static int ocfs2_drop_lock(struct ocfs2_super *osb,
struct ocfs2_lock_res *lockres,
struct drop_lock_cb *dcb)
struct ocfs2_lock_res *lockres)
{
enum dlm_status status;
unsigned long flags;
@ -2274,8 +2283,12 @@ static int ocfs2_drop_lock(struct ocfs2_super *osb,
spin_lock_irqsave(&lockres->l_lock, flags);
}
if (dcb)
dcb->drop_func(lockres, dcb->drop_data);
if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB) {
if (lockres->l_flags & OCFS2_LOCK_ATTACHED &&
lockres->l_level == LKM_EXMODE &&
!(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH))
lockres->l_ops->set_lvb(lockres);
}
if (lockres->l_flags & OCFS2_LOCK_BUSY)
mlog(ML_ERROR, "destroying busy lock: \"%s\"\n",
@ -2355,7 +2368,7 @@ void ocfs2_simple_drop_lockres(struct ocfs2_super *osb,
int ret;
ocfs2_mark_lockres_freeing(lockres);
ret = ocfs2_drop_lock(osb, lockres, NULL);
ret = ocfs2_drop_lock(osb, lockres);
if (ret)
mlog_errno(ret);
}
@ -2366,22 +2379,9 @@ static void ocfs2_drop_osb_locks(struct ocfs2_super *osb)
ocfs2_simple_drop_lockres(osb, &osb->osb_rename_lockres);
}
static void ocfs2_meta_pre_drop(struct ocfs2_lock_res *lockres, void *data)
{
struct inode *inode = data;
/* the metadata lock requires a bit more work as we have an
* LVB to worry about. */
if (lockres->l_flags & OCFS2_LOCK_ATTACHED &&
lockres->l_level == LKM_EXMODE &&
!(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH))
__ocfs2_stuff_meta_lvb(inode);
}
int ocfs2_drop_inode_locks(struct inode *inode)
{
int status, err;
struct drop_lock_cb meta_dcb = { ocfs2_meta_pre_drop, inode, };
mlog_entry_void();
@ -2389,24 +2389,21 @@ int ocfs2_drop_inode_locks(struct inode *inode)
* ocfs2_clear_inode has done it for us. */
err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb),
&OCFS2_I(inode)->ip_data_lockres,
NULL);
&OCFS2_I(inode)->ip_data_lockres);
if (err < 0)
mlog_errno(err);
status = err;
err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb),
&OCFS2_I(inode)->ip_meta_lockres,
&meta_dcb);
&OCFS2_I(inode)->ip_meta_lockres);
if (err < 0)
mlog_errno(err);
if (err < 0 && !status)
status = err;
err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb),
&OCFS2_I(inode)->ip_rw_lockres,
NULL);
&OCFS2_I(inode)->ip_rw_lockres);
if (err < 0)
mlog_errno(err);
if (err < 0 && !status)